在这里插入图片描述

目录

  1. 概述
  2. 字符串查找基础
  3. 核心查找方法
  4. Kotlin 源代码
  5. JavaScript 编译代码
  6. ArkTS 调用代码
  7. 查找性能指标详解
  8. 实战应用

概述

字符串查找是程序开发中最常见的操作之一。在处理大量文本数据时,选择合适的字符串查找方式对程序性能有重要影响。contains、indexOf、正则表达式等不同的查找方式在性能上差异明显。本文档介绍如何在 Kotlin Multiplatform (KMP) 框架下,结合 OpenHarmony 鸿蒙操作系统,实现一个功能完整的字符串查找方式对比分析系统。

字符串查找对比系统是一个综合性的性能分析平台,它不仅能够对不同字符串查找方式进行性能测试,还能够进行查找方法对比、生成性能报告、提供优化建议。通过KMP框架的跨端能力,这个工具可以在Android、iOS、Web和OpenHarmony等多个平台上运行,为开发者提供了一个强大的性能优化决策辅助工具。

字符串查找对比的重要性

字符串查找对比在现代软件开发中的重要性日益凸显:

  1. 查找效率:合理选择查找方式能够显著提升查找效率。
  2. 性能优化:优化查找能够提升程序性能。
  3. 响应速度:快速的查找能够改善用户体验。
  4. 系统稳定:合理的查找方式能够提升系统稳定性。
  5. 可维护性:不同查找方式的代码复杂度不同。

工具的核心价值

字符串查找对比分析系统提供以下价值:

  • 多种查找方式对比:支持contains、indexOf、正则表达式等多种方式
  • 详细性能数据:提供详细的查找性能测试数据和分析
  • 性能分析:分析不同查找方式的性能差异和适用场景
  • 优化建议:根据测试结果提供优化建议
  • 实时对比:支持实时的查找性能对比
  • 跨平台支持:一份代码可在多个平台运行,提高开发效率

字符串查找基础

核心概念

contains方法:检查字符串是否包含指定子字符串。

indexOf方法:查找子字符串在字符串中的位置。

正则表达式:使用正则表达式进行复杂的字符串匹配。

查找性能:衡量字符串查找效率的指标。

匹配成功率:查找成功的概率。

平均查找时间:平均每次查找的时间。

常见的字符串查找方式

contains查找:简单快速的包含性检查。

indexOf查找:获取子字符串的位置。

lastIndexOf查找:获取最后一个子字符串的位置。

正则表达式匹配:使用正则表达式进行复杂匹配。

split分割:使用分割方式进行查找。

replace替换:使用替换方式进行查找。

影响字符串查找性能的关键因素

字符串长度:字符串越长,查找性能差异越明显。

查找模式:不同的查找模式性能差异较大。

查找频率:频繁查找时性能差异更明显。

缓存效应:缓存会影响查找性能。

编译优化:编译器优化会影响性能。

内存大小:可用内存影响查找性能。


核心查找方法

1. contains方法查找

使用contains方法进行简单的包含性检查。

2. indexOf方法查找

使用indexOf方法查找子字符串的位置。

3. 正则表达式查找

使用正则表达式进行复杂的字符串匹配。

4. split分割查找

使用分割方式进行字符串查找。

5. 查找性能对比

对比不同查找方式的性能差异。

6. 优化建议生成

根据测试结果生成优化建议。


Kotlin 源代码

// StringSearchAnalyzer.kt
import java.time.LocalDateTime
import kotlin.system.measureTimeMillis

data class SearchTest(
    val testId: String,
    val testName: String,
    val searchMethod: String,
    val textLength: Int,
    val searchCount: Int
)

data class SearchResult(
    val testId: String,
    val testName: String,
    val searchMethod: String,
    val textLength: Int,
    val searchCount: Int,
    val executionTime: Long,
    val averageSearchTime: Double,
    val successRate: Double,
    val timestamp: String
)

data class SearchMetrics(
    val totalTests: Long,
    val averageExecutionTime: Long,
    val fastestMethod: String,
    val slowestMethod: String,
    val bestSuccessRate: Double,
    val worstSuccessRate: Double
)

data class SearchComparison(
    val results: List<SearchResult>,
    val fastestMethod: String,
    val fastestTime: Long,
    val slowestMethod: String,
    val slowestTime: Long,
    val recommendation: String
)

class StringSearchAnalyzer {
    private val tests = mutableListOf<SearchTest>()
    private val results = mutableListOf<SearchResult>()
    private var testIdCounter = 0
    
    // 添加搜索测试
    fun addTest(
        testName: String,
        searchMethod: String,
        textLength: Int,
        searchCount: Int
    ): SearchTest {
        val id = "STRSEARCH${++testIdCounter}"
        val test = SearchTest(id, testName, searchMethod, textLength, searchCount)
        tests.add(test)
        return test
    }
    
    // 测试contains方法
    fun testContains(testId: String): SearchResult {
        val test = tests.find { it.testId == testId }
            ?: return SearchResult("", "", "", 0, 0, 0, 0.0, 0.0, "")
        
        val text = "a".repeat(test.textLength)
        val pattern = "a".repeat(10)
        var successCount = 0
        
        val executionTime = measureTimeMillis {
            repeat(test.searchCount) {
                if (text.contains(pattern)) {
                    successCount++
                }
            }
        }
        
        val averageSearchTime = executionTime.toDouble() / test.searchCount
        val successRate = successCount.toDouble() / test.searchCount
        
        val result = SearchResult(
            testId, test.testName, "contains", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, LocalDateTime.now().toString()
        )
        
        results.add(result)
        return result
    }
    
    // 测试indexOf方法
    fun testIndexOf(testId: String): SearchResult {
        val test = tests.find { it.testId == testId }
            ?: return SearchResult("", "", "", 0, 0, 0, 0.0, 0.0, "")
        
        val text = "a".repeat(test.textLength)
        val pattern = "a".repeat(10)
        var successCount = 0
        
        val executionTime = measureTimeMillis {
            repeat(test.searchCount) {
                if (text.indexOf(pattern) >= 0) {
                    successCount++
                }
            }
        }
        
        val averageSearchTime = executionTime.toDouble() / test.searchCount
        val successRate = successCount.toDouble() / test.searchCount
        
        val result = SearchResult(
            testId, test.testName, "indexOf", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, LocalDateTime.now().toString()
        )
        
        results.add(result)
        return result
    }
    
    // 测试正则表达式
    fun testRegex(testId: String): SearchResult {
        val test = tests.find { it.testId == testId }
            ?: return SearchResult("", "", "", 0, 0, 0, 0.0, 0.0, "")
        
        val text = "a".repeat(test.textLength)
        val pattern = Regex("a{10}")
        var successCount = 0
        
        val executionTime = measureTimeMillis {
            repeat(test.searchCount) {
                if (pattern.containsMatchIn(text)) {
                    successCount++
                }
            }
        }
        
        val averageSearchTime = executionTime.toDouble() / test.searchCount
        val successRate = successCount.toDouble() / test.searchCount
        
        val result = SearchResult(
            testId, test.testName, "regex", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, LocalDateTime.now().toString()
        )
        
        results.add(result)
        return result
    }
    
    // 测试split分割
    fun testSplit(testId: String): SearchResult {
        val test = tests.find { it.testId == testId }
            ?: return SearchResult("", "", "", 0, 0, 0, 0.0, 0.0, "")
        
        val text = "a,b,c,d,e,f,g,h,i,j".repeat(test.textLength / 20)
        var successCount = 0
        
        val executionTime = measureTimeMillis {
            repeat(test.searchCount) {
                val parts = text.split(",")
                if (parts.isNotEmpty()) {
                    successCount++
                }
            }
        }
        
        val averageSearchTime = executionTime.toDouble() / test.searchCount
        val successRate = successCount.toDouble() / test.searchCount
        
        val result = SearchResult(
            testId, test.testName, "split", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, LocalDateTime.now().toString()
        )
        
        results.add(result)
        return result
    }
    
    // 获取查找指标
    fun getSearchMetrics(): SearchMetrics {
        if (results.isEmpty()) {
            return SearchMetrics(0, 0, "", "", 0.0, 0.0)
        }
        
        val totalTests = tests.size.toLong()
        val averageExecutionTime = results.map { it.executionTime }.average().toLong()
        val fastestMethod = results.minByOrNull { it.executionTime }?.searchMethod ?: ""
        val slowestMethod = results.maxByOrNull { it.executionTime }?.searchMethod ?: ""
        val bestSuccessRate = results.maxOf { it.successRate }
        val worstSuccessRate = results.minOf { it.successRate }
        
        return SearchMetrics(
            totalTests, averageExecutionTime, fastestMethod, slowestMethod,
            bestSuccessRate, worstSuccessRate
        )
    }
    
    // 获取所有结果
    fun getAllResults(): List<SearchResult> {
        return results.toList()
    }
    
    // 查找方式对比
    fun compareSearchMethods(testId: String): SearchComparison {
        val testResults = results.filter { it.testId == testId }
        
        val fastestResult = testResults.minByOrNull { it.executionTime }
        val slowestResult = testResults.maxByOrNull { it.executionTime }
        
        val recommendation = when {
            testResults.any { it.searchMethod == "contains" && it.executionTime < 10 } -> 
                "contains方法性能最优,强烈推荐用于简单查找"
            testResults.any { it.searchMethod == "indexOf" && it.executionTime < 10 } -> 
                "indexOf方法性能优秀,适合需要位置信息的查找"
            else -> "根据查找需求选择合适的方法"
        }
        
        return SearchComparison(
            testResults, fastestResult?.searchMethod ?: "", fastestResult?.executionTime ?: 0,
            slowestResult?.searchMethod ?: "", slowestResult?.executionTime ?: 0, recommendation
        )
    }
    
    // 生成查找性能报告
    fun generateSearchReport(): Map<String, Any> {
        val metrics = getSearchMetrics()
        
        return mapOf(
            "timestamp" to LocalDateTime.now().toString(),
            "metrics" to metrics,
            "results" to results.toList(),
            "recommendations" to generateRecommendations(metrics)
        )
    }
    
    // 生成建议
    private fun generateRecommendations(metrics: SearchMetrics): List<String> {
        val recommendations = mutableListOf<String>()
        
        if (metrics.fastestMethod == "contains") {
            recommendations.add("⚡ contains方法性能最优,适合简单的包含性检查")
        } else if (metrics.fastestMethod == "indexOf") {
            recommendations.add("⚡ indexOf方法性能优秀,适合需要位置信息的查找")
        }
        
        if (metrics.bestSuccessRate > 0.95) {
            recommendations.add("✅ 查找成功率高,查找方式选择合理")
        }
        
        recommendations.add("✅ 简单查找使用contains,复杂查找使用正则表达式")
        recommendations.add("✅ 避免在循环中使用正则表达式,提前编译正则表达式")
        
        return recommendations
    }
    
    // 清空数据
    fun clearData() {
        tests.clear()
        results.clear()
    }
}

fun main() {
    val analyzer = StringSearchAnalyzer()
    
    // 添加测试
    analyzer.addTest("长文本查找", "contains", 100000, 1000)
    analyzer.addTest("长文本查找", "indexOf", 100000, 1000)
    
    // 执行测试
    val result1 = analyzer.testContains("STRSEARCH1")
    val result2 = analyzer.testIndexOf("STRSEARCH1")
    val result3 = analyzer.testRegex("STRSEARCH1")
    val result4 = analyzer.testSplit("STRSEARCH1")
    
    println("字符串查找性能测试结果:")
    println("contains: ${result1.executionTime}ms")
    println("indexOf: ${result2.executionTime}ms")
    println("regex: ${result3.executionTime}ms")
    println("split: ${result4.executionTime}ms")
    
    // 生成报告
    val report = analyzer.generateSearchReport()
    println("\n查找性能报告已生成")
}

Kotlin代码说明:这个Kotlin实现提供了完整的字符串查找性能测试功能。StringSearchAnalyzer 类能够管理查找测试、执行不同查找方式的测试、进行查找方法对比、生成性能报告。通过使用数据类和科学的测试方法,代码既简洁又准确。系统支持多种查找方式的性能测试,从单个查找方式的详细测试到多个方式的对比分析,为开发者提供了全面的性能优化决策支持。


JavaScript 编译代码

// StringSearchAnalyzer.js
class SearchTest {
    constructor(testId, testName, searchMethod, textLength, searchCount) {
        this.testId = testId;
        this.testName = testName;
        this.searchMethod = searchMethod;
        this.textLength = textLength;
        this.searchCount = searchCount;
    }
}

class SearchResult {
    constructor(testId, testName, searchMethod, textLength, searchCount, executionTime, averageSearchTime, successRate, timestamp) {
        this.testId = testId;
        this.testName = testName;
        this.searchMethod = searchMethod;
        this.textLength = textLength;
        this.searchCount = searchCount;
        this.executionTime = executionTime;
        this.averageSearchTime = averageSearchTime;
        this.successRate = successRate;
        this.timestamp = timestamp;
    }
}

class SearchMetrics {
    constructor(totalTests, averageExecutionTime, fastestMethod, slowestMethod, bestSuccessRate, worstSuccessRate) {
        this.totalTests = totalTests;
        this.averageExecutionTime = averageExecutionTime;
        this.fastestMethod = fastestMethod;
        this.slowestMethod = slowestMethod;
        this.bestSuccessRate = bestSuccessRate;
        this.worstSuccessRate = worstSuccessRate;
    }
}

class StringSearchAnalyzer {
    constructor() {
        this.tests = [];
        this.results = [];
        this.testIdCounter = 0;
    }
    
    addTest(testName, searchMethod, textLength, searchCount) {
        const id = `STRSEARCH${++this.testIdCounter}`;
        const test = new SearchTest(id, testName, searchMethod, textLength, searchCount);
        this.tests.push(test);
        return test;
    }
    
    testIncludes(testId) {
        const test = this.tests.find(t => t.testId === testId);
        if (!test) return null;
        
        const text = "a".repeat(test.textLength);
        const pattern = "a".repeat(10);
        let successCount = 0;
        
        const startTime = performance.now();
        for (let i = 0; i < test.searchCount; i++) {
            if (text.includes(pattern)) {
                successCount++;
            }
        }
        const endTime = performance.now();
        
        const executionTime = Math.round(endTime - startTime);
        const averageSearchTime = executionTime / test.searchCount;
        const successRate = successCount / test.searchCount;
        
        const result = new SearchResult(
            testId, test.testName, "includes", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, new Date().toISOString()
        );
        
        this.results.push(result);
        return result;
    }
    
    testIndexOf(testId) {
        const test = this.tests.find(t => t.testId === testId);
        if (!test) return null;
        
        const text = "a".repeat(test.textLength);
        const pattern = "a".repeat(10);
        let successCount = 0;
        
        const startTime = performance.now();
        for (let i = 0; i < test.searchCount; i++) {
            if (text.indexOf(pattern) >= 0) {
                successCount++;
            }
        }
        const endTime = performance.now();
        
        const executionTime = Math.round(endTime - startTime);
        const averageSearchTime = executionTime / test.searchCount;
        const successRate = successCount / test.searchCount;
        
        const result = new SearchResult(
            testId, test.testName, "indexOf", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, new Date().toISOString()
        );
        
        this.results.push(result);
        return result;
    }
    
    testRegex(testId) {
        const test = this.tests.find(t => t.testId === testId);
        if (!test) return null;
        
        const text = "a".repeat(test.textLength);
        const pattern = /a{10}/;
        let successCount = 0;
        
        const startTime = performance.now();
        for (let i = 0; i < test.searchCount; i++) {
            if (pattern.test(text)) {
                successCount++;
            }
        }
        const endTime = performance.now();
        
        const executionTime = Math.round(endTime - startTime);
        const averageSearchTime = executionTime / test.searchCount;
        const successRate = successCount / test.searchCount;
        
        const result = new SearchResult(
            testId, test.testName, "regex", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, new Date().toISOString()
        );
        
        this.results.push(result);
        return result;
    }
    
    testSplit(testId) {
        const test = this.tests.find(t => t.testId === testId);
        if (!test) return null;
        
        const text = "a,b,c,d,e,f,g,h,i,j".repeat(Math.floor(test.textLength / 20));
        let successCount = 0;
        
        const startTime = performance.now();
        for (let i = 0; i < test.searchCount; i++) {
            const parts = text.split(",");
            if (parts.length > 0) {
                successCount++;
            }
        }
        const endTime = performance.now();
        
        const executionTime = Math.round(endTime - startTime);
        const averageSearchTime = executionTime / test.searchCount;
        const successRate = successCount / test.searchCount;
        
        const result = new SearchResult(
            testId, test.testName, "split", test.textLength, test.searchCount,
            executionTime, averageSearchTime, successRate, new Date().toISOString()
        );
        
        this.results.push(result);
        return result;
    }
    
    getSearchMetrics() {
        if (this.results.length === 0) {
            return new SearchMetrics(0, 0, "", "", 0, 0);
        }
        
        const totalTests = this.tests.length;
        const averageExecutionTime = Math.round(this.results.reduce((sum, r) => sum + r.executionTime, 0) / this.results.length);
        const fastestMethod = this.results.reduce((min, r) => r.executionTime < min.executionTime ? r : min).searchMethod;
        const slowestMethod = this.results.reduce((max, r) => r.executionTime > max.executionTime ? r : max).searchMethod;
        const bestSuccessRate = Math.max(...this.results.map(r => r.successRate));
        const worstSuccessRate = Math.min(...this.results.map(r => r.successRate));
        
        return new SearchMetrics(totalTests, averageExecutionTime, fastestMethod, slowestMethod, bestSuccessRate, worstSuccessRate);
    }
    
    getAllResults() {
        return this.results;
    }
    
    compareSearchMethods(testId) {
        const testResults = this.results.filter(r => r.testId === testId);
        
        const fastestResult = testResults.reduce((min, r) => r.executionTime < min.executionTime ? r : min);
        const slowestResult = testResults.reduce((max, r) => r.executionTime > max.executionTime ? r : max);
        
        let recommendation;
        if (testResults.some(r => r.searchMethod === "includes" && r.executionTime < 10)) {
            recommendation = "includes方法性能最优,强烈推荐用于简单查找";
        } else if (testResults.some(r => r.searchMethod === "indexOf" && r.executionTime < 10)) {
            recommendation = "indexOf方法性能优秀,适合需要位置信息的查找";
        } else {
            recommendation = "根据查找需求选择合适的方法";
        }
        
        return {
            results: testResults,
            fastestMethod: fastestResult.searchMethod,
            fastestTime: fastestResult.executionTime,
            slowestMethod: slowestResult.searchMethod,
            slowestTime: slowestResult.executionTime,
            recommendation: recommendation
        };
    }
    
    generateSearchReport() {
        const metrics = this.getSearchMetrics();
        
        return {
            timestamp: new Date().toISOString(),
            metrics: metrics,
            results: this.results,
            recommendations: this.generateRecommendations(metrics)
        };
    }
    
    generateRecommendations(metrics) {
        const recommendations = [];
        
        if (metrics.fastestMethod === "includes") {
            recommendations.push("⚡ includes方法性能最优,适合简单的包含性检查");
        } else if (metrics.fastestMethod === "indexOf") {
            recommendations.push("⚡ indexOf方法性能优秀,适合需要位置信息的查找");
        }
        
        if (metrics.bestSuccessRate > 0.95) {
            recommendations.push("✅ 查找成功率高,查找方式选择合理");
        }
        
        recommendations.push("✅ 简单查找使用includes,复杂查找使用正则表达式");
        recommendations.push("✅ 避免在循环中使用正则表达式,提前编译正则表达式");
        
        return recommendations;
    }
    
    clearData() {
        this.tests = [];
        this.results = [];
    }
}

// 使用示例
const analyzer = new StringSearchAnalyzer();

analyzer.addTest("长文本查找", "includes", 100000, 1000);
analyzer.addTest("长文本查找", "indexOf", 100000, 1000);

const result1 = analyzer.testIncludes("STRSEARCH1");
const result2 = analyzer.testIndexOf("STRSEARCH1");
const result3 = analyzer.testRegex("STRSEARCH1");
const result4 = analyzer.testSplit("STRSEARCH1");

console.log("字符串查找性能测试结果:");
console.log(`includes: ${result1.executionTime}ms`);
console.log(`indexOf: ${result2.executionTime}ms`);
console.log(`regex: ${result3.executionTime}ms`);
console.log(`split: ${result4.executionTime}ms`);

const report = analyzer.generateSearchReport();
console.log("\n查找性能报告已生成");

JavaScript代码说明:JavaScript版本是Kotlin代码的直接转译。我们使用ES6的class语法定义各个类,使用performance API进行时间测试。整体逻辑和算法与Kotlin版本保持一致,确保跨平台的一致性。JavaScript的灵活性使得代码更加简洁,同时保持了清晰的结构和完整的功能。


ArkTS 调用代码

// StringSearchAnalyzerPage.ets
import { StringSearchAnalyzer } from './StringSearchAnalyzer';

@Entry
@Component
struct StringSearchAnalyzerPage {
    @State testName: string = '长文本查找';
    @State searchMethod: string = 'includes';
    @State textLength: number = 100000;
    @State searchCount: number = 1000;
    @State selectedTab: number = 0;
    @State results: Array<any> = [];
    @State metrics: any = null;
    @State isLoading: boolean = false;
    @State errorMessage: string = '';
    @State report: any = null;
    
    private analyzer: StringSearchAnalyzer = new StringSearchAnalyzer();
    private searchMethods = ['includes', 'indexOf', 'regex', 'split'];
    
    addAndTest() {
        if (this.textLength <= 0 || this.searchCount <= 0) {
            this.errorMessage = '请输入有效的参数';
            return;
        }
        
        this.isLoading = true;
        this.errorMessage = '';
        
        try {
            this.analyzer.addTest(
                this.testName,
                this.searchMethod,
                this.textLength,
                this.searchCount
            );
            
            const testId = `STRSEARCH${this.analyzer.tests.length}`;
            
            if (this.searchMethod === 'includes') {
                this.analyzer.testIncludes(testId);
            } else if (this.searchMethod === 'indexOf') {
                this.analyzer.testIndexOf(testId);
            } else if (this.searchMethod === 'regex') {
                this.analyzer.testRegex(testId);
            } else if (this.searchMethod === 'split') {
                this.analyzer.testSplit(testId);
            }
            
            this.results = this.analyzer.getAllResults();
            this.metrics = this.analyzer.getSearchMetrics();
            
            AlertDialog.show({ message: '字符串查找测试已完成' });
            
            // 重置表单
            this.testName = '';
            this.textLength = 100000;
            this.searchCount = 1000;
        } catch (error) {
            this.errorMessage = '测试失败: ' + error.message;
        } finally {
            this.isLoading = false;
        }
    }
    
    generateReport() {
        this.isLoading = true;
        
        try {
            this.report = this.analyzer.generateSearchReport();
        } catch (error) {
            this.errorMessage = '生成报告失败: ' + error.message;
        } finally {
            this.isLoading = false;
        }
    }
    
    getMethodColor(method: string): string {
        switch (method) {
            case 'includes': return '#4CAF50';
            case 'indexOf': return '#2196F3';
            case 'regex': return '#FF9800';
            case 'split': return '#F44336';
            default: return '#999999';
        }
    }
    
    build() {
        Column() {
            Text('字符串查找方式对比')
                .fontSize(24)
                .fontWeight(FontWeight.Bold)
                .margin({ top: 20, bottom: 20 })
            
            Tabs({ barPosition: BarPosition.Start }) {
                TabContent() {
                    Column() {
                        Text('测试参数').fontSize(14).fontWeight(FontWeight.Bold).margin({ bottom: 15 })
                        
                        Text('测试名称:').fontSize(12).margin({ bottom: 5 })
                        TextInput({ placeholder: '长文本查找' })
                            .value(this.testName)
                            .onChange((value: string) => { this.testName = value; })
                            .height(40).padding(10).border({ width: 1, color: '#cccccc' }).margin({ bottom: 15 })
                        
                        Row() {
                            Column() {
                                Text('查找方法:').fontSize(12).margin({ bottom: 5 })
                                Select(this.searchMethods.map(m => ({ value: m })))
                                    .value(this.searchMethod)
                                    .onSelect((index: number, value?: string) => {
                                        this.searchMethod = value || 'includes';
                                    })
                            }
                            .flex(1)
                            
                            Column() {
                                Text('文本长度:').fontSize(12).margin({ bottom: 5 })
                                TextInput({ placeholder: '100000' })
                                    .type(InputType.Number)
                                    .value(this.textLength.toString())
                                    .onChange((value: string) => { this.textLength = parseInt(value) || 0; })
                                    .height(40).padding(10).border({ width: 1, color: '#cccccc' })
                            }
                            .flex(1)
                            .margin({ left: 10 })
                        }
                        .margin({ bottom: 15 })
                        
                        Text('查找次数:').fontSize(12).margin({ bottom: 5 })
                        TextInput({ placeholder: '1000' })
                            .type(InputType.Number)
                            .value(this.searchCount.toString())
                            .onChange((value: string) => { this.searchCount = parseInt(value) || 0; })
                            .height(40).padding(10).border({ width: 1, color: '#cccccc' }).margin({ bottom: 15 })
                        
                        Button('执行查找测试').width('100%').height(40).margin({ bottom: 15 })
                            .onClick(() => { this.addAndTest(); }).enabled(!this.isLoading)
                        
                        if (this.errorMessage) {
                            Text(this.errorMessage).fontSize(12).fontColor('#F44336').margin({ bottom: 15 })
                        }
                    }
                    .padding(15)
                }
                .tabBar('⚙️ 测试')
                
                TabContent() {
                    Column() {
                        if (this.results.length > 0) {
                            Text('查找结果').fontSize(16).fontWeight(FontWeight.Bold).margin({ bottom: 15 })
                            
                            List() {
                                ForEach(this.results, (result: any) => {
                                    ListItem() {
                                        Column() {
                                            Row() {
                                                Text(result.searchMethod).fontSize(14).fontWeight(FontWeight.Bold).flex(1)
                                                Text(`${result.executionTime}ms`).fontSize(12).fontColor(this.getMethodColor(result.searchMethod))
                                                    .fontWeight(FontWeight.Bold)
                                            }
                                            .margin({ bottom: 10 })
                                            
                                            Row() {
                                                Text('平均查找时间:').fontSize(11)
                                                Text(result.averageSearchTime.toFixed(4) + 'ms').fontSize(11).fontWeight(FontWeight.Bold)
                                                    .fontColor('#2196F3')
                                            }
                                            .margin({ bottom: 5 })
                                            
                                            Row() {
                                                Text('成功率:').fontSize(11)
                                                Text((result.successRate * 100).toFixed(1) + '%').fontSize(11).fontWeight(FontWeight.Bold)
                                            }
                                        }
                                        .padding(10).border({ width: 1, color: '#eeeeee' }).borderRadius(5)
                                    }
                                }, (result: any) => result.searchMethod)
                            }
                        } else {
                            Text('请先执行测试').fontSize(12).fontColor('#999999')
                        }
                    }
                    .padding(15)
                }
                .tabBar('📊 结果')
                
                TabContent() {
                    Column() {
                        if (this.metrics) {
                            Text('查找指标').fontSize(16).fontWeight(FontWeight.Bold).margin({ bottom: 15 })
                            
                            Row() {
                                Column() {
                                    Text('平均执行时间').fontSize(11).fontColor('#999999')
                                    Text(`${this.metrics.averageExecutionTime}ms`).fontSize(18)
                                        .fontWeight(FontWeight.Bold).fontColor('#2196F3').margin({ top: 5 })
                                }
                                .flex(1).alignItems(HorizontalAlign.Center).padding(15).backgroundColor('#F5F5F5').borderRadius(5)
                                
                                Column() {
                                    Text('最快方法').fontSize(11).fontColor('#999999')
                                    Text(this.metrics.fastestMethod).fontSize(14)
                                        .fontWeight(FontWeight.Bold).fontColor('#4CAF50').margin({ top: 5 })
                                }
                                .flex(1).alignItems(HorizontalAlign.Center).padding(15).backgroundColor('#F5F5F5').borderRadius(5)
                                .margin({ left: 10 })
                            }
                            .margin({ bottom: 15 })
                            
                            Column() {
                                Row() {
                                    Text('最慢方法:').fontSize(12)
                                    Text(this.metrics.slowestMethod).fontSize(12).fontWeight(FontWeight.Bold)
                                }
                                .margin({ bottom: 10 })
                                
                                Row() {
                                    Text('最佳成功率:').fontSize(12)
                                    Text((this.metrics.bestSuccessRate * 100).toFixed(1) + '%').fontSize(12).fontWeight(FontWeight.Bold)
                                }
                                .margin({ bottom: 10 })
                                
                                Row() {
                                    Text('最差成功率:').fontSize(12)
                                    Text((this.metrics.worstSuccessRate * 100).toFixed(1) + '%').fontSize(12).fontWeight(FontWeight.Bold)
                                }
                            }
                            .padding(10).backgroundColor('#F5F5F5').borderRadius(5)
                        } else {
                            Text('请先执行测试').fontSize(12).fontColor('#999999')
                        }
                    }
                    .padding(15)
                }
                .tabBar('📈 指标')
                
                TabContent() {
                    Column() {
                        Button('生成报告').width('100%').height(40).margin({ bottom: 15 })
                            .onClick(() => { this.generateReport(); })
                        
                        if (this.report) {
                            Text('查找性能报告').fontSize(16).fontWeight(FontWeight.Bold).margin({ bottom: 15 })
                            
                            if (this.report.recommendations && this.report.recommendations.length > 0) {
                                Text('优化建议:').fontSize(14).fontWeight(FontWeight.Bold).margin({ bottom: 10 })
                                
                                Column() {
                                    ForEach(this.report.recommendations, (rec: string, index: number) => {
                                        Row() {
                                            Text('•').fontSize(14).fontWeight(FontWeight.Bold).margin({ right: 10 })
                                            Text(rec).fontSize(11).flex(1)
                                        }
                                        .padding(10).margin({ bottom: 8 }).backgroundColor('#E3F2FD').borderRadius(5)
                                    }, (rec: string, index: number) => index.toString())
                                }
                            }
                        }
                    }
                    .padding(15)
                }
                .tabBar('📋 报告')
            }
            .width('100%')
            .flex(1)
        }
        .padding(10)
        .width('100%')
        .height('100%')
    }
}

ArkTS代码说明:这个ArkTS实现展示了如何在OpenHarmony应用中集成字符串查找方式对比分析系统。通过使用标签页组件,用户可以在参数设置、结果查看、指标统计和报告生成之间切换。UI设计直观,提供了良好的用户体验。每个标签页都有不同的功能,用户可以全面地进行查找性能测试和优化分析。


查找性能指标详解

查找方法

includes方法:检查字符串是否包含指定子字符串,简单快速。

indexOf方法:查找子字符串的位置,返回索引值。

正则表达式:使用正则表达式进行复杂匹配,功能强大但性能较低。

split方法:使用分割方式进行查找,适合特定场景。

性能指标

执行时间:查找操作的总执行时间,单位为毫秒。

平均查找时间:每次查找的平均时间。

成功率:查找成功的概率。

平均执行时间:所有查找的平均执行时间。


实战应用

应用场景1:查找方法优化

开发者可以使用这个工具测试不同查找方法的性能,选择最优方案。

应用场景2:文本处理优化

在文本处理中选择合适的查找方法,提升性能。

应用场景3:性能基准建立

建立查找性能基准,用于后续优化的参考。

应用场景4:教学演示

在教学中演示不同查找方法的性能差异。


总结

字符串查找方式对比是软件性能优化中的重要内容。通过KMP框架和OpenHarmony操作系统的结合,我们可以实现一个功能完整、高效可靠的字符串查找对比分析系统。

这个工具不仅能够测试不同查找方法的性能,还能够进行方法对比、生成性能报告、提供优化建议。通过本文介绍的Kotlin实现、JavaScript编译和ArkTS调用,开发者可以快速构建自己的性能分析系统。

在实际应用中,字符串查找对比的价值远不止于此。从提升程序性能到优化用户体验,从减少查找时间到提升系统稳定性,字符串查找优化都发挥着重要的作用。通过持续改进和优化,可以构建更加高效和稳定的软件系统。

掌握好字符串查找优化的方法和工具,对于提升软件性能和实现高效编程都有重要的帮助。通过这个系统的学习和使用,希望能够帮助开发者更好地进行性能优化,编写高效的代码,最终构建高性能的软件系统。

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