Java中从方括号字符串中提取并验证键值对子串的教程

[start:0 ms, material requests:0 ms, fulfilled requests:329 ms, sum responses:1 ms, total:330 ms]

String valueOutOfRegex = "[start:0 ms, material requests:0 ms, fulfilled requests:329 ms, sum responses:1 ms, total:330 ms]";
// 移除字符串开头和结尾的方括号
String valueWithRemovedBrackets = valueOutOfRegex.substring(1, valueOutOfRegex.length() - 1);
System.out.println("移除方括号后的字符串: " + valueWithRemovedBrackets);
// 输出: start:0 ms, material requests:0 ms, fulfilled requests:329 ms, sum responses:1 ms, total:330 ms

import java.util.Arrays;
import java.util.Map;
import java.util.stream.Collectors;

// ... (接上一步的代码)

Map<String, String> parsedMap = Arrays.stream(valueWithRemovedBrackets.split(","))
                                      .map(String::trim) // 确保每个键值对字符串去除前后空格
                                      .collect(Collectors.toMap(
                                          s -> s.split(":", 2)[0].trim(), // 键：以第一个冒号分割，取第一部分，并去除空格
                                          s -> s.split(":", 2)[1].trim()  // 值：以第一个冒号分割，取第二部分，并去除空格
                                      ));

System.out.println("解析后的Map: " + parsedMap);
// 输出示例: {total=330 ms, fulfilled requests=329 ms, material requests=0 ms, start=0 ms, sum responses=1 ms}

// ... (接上一步的代码)

String startValueStr = parsedMap.get("start");
String materialRequestsValueStr = parsedMap.get("material requests");

System.out.println("start的值: " + startValueStr);
System.out.println("material requests的值: " + materialRequestsValueStr);

// 验证逻辑
if (startValueStr != null && materialRequestsValueStr != null) {
    try {
        // 提取数值部分并转换为整数
        int startValue = Integer.parseInt(startValueStr.replace(" ms", "").trim());
        int materialRequestsValue = Integer.parseInt(materialRequestsValueStr.replace(" ms", "").trim());

        if (startValue >= 0 && materialRequestsValue >= 0) {
            System.out.println("验证通过: start (" + startValue + " ms) 和 material requests (" + materialRequestsValue + " ms) 的值均不小于零。");
        } else {
            System.out.println("验证失败: start 或 material requests 的值小于零。");
        }
    } catch (NumberFormatException e) {
        System.err.println("错误: 无法将值转换为数字进行验证。 " + e.getMessage());
    }
} else {
    System.err.println("错误: 无法找到 'start' 或 'material requests' 键。");
}

import java.util.Arrays;
import java.util.Map;
import java.util.stream.Collectors;

public class StringParserAndValidator {

    public static void main(String[] args) {
        String valueOutOfRegex = "[start:0 ms, material requests:0 ms, fulfilled requests:329 ms, sum responses:1 ms, total:330 ms]";

        System.out.println("原始字符串: " + valueOutOfRegex);

        // 1. 移除方括号
        String valueWithRemovedBrackets = valueOutOfRegex.substring(1, valueOutOfRegex.length() - 1);
        System.out.println("1. 移除方括号后的字符串: " + valueWithRemovedBrackets);

        // 2. 解析为键值对Map
        Map<String, String> parsedMap = Arrays.stream(valueWithRemovedBrackets.split(","))
                                              .map(String::trim) // 确保每个键值对字符串去除前后空格
                                              .collect(Collectors.toMap(
                                                  s -> s.split(":", 2)[0].trim(), // 键
                                                  s -> s.split(":", 2)[1].trim()  // 值
                                              ));

        System.out.println("2. 解析后的Map: " + parsedMap);

        // 3. 访问并验证特定键的值
        String startValueStr = parsedMap.get("start");
        String materialRequestsValueStr = parsedMap.get("material requests");

        System.out.println("3. 获取 'start' 的值: " + startValueStr);
        System.out.println("3. 获取 'material requests' 的值: " + materialRequestsValueStr);

        if (startValueStr != null && materialRequestsValueStr != null) {
            try {
                // 移除单位 " ms" 并转换为整数
                int startValue = Integer.parseInt(startValueStr.replace(" ms", "").trim());
                int materialRequestsValue = Integer.parseInt(materialRequestsValueStr.replace(" ms", "").trim());

                System.out.println("3. 转换为整数: start=" + startValue + ", material requests=" + materialRequestsValue);

                if (startValue >= 0 && materialRequestsValue >= 0) {
                    System.out.println("3. 验证结果: 'start' 和 'material requests' 的值均不小于零。");
                } else {
                    System.out.println("3. 验证结果: 'start' 或 'material requests' 的值小于零。");
                }
            } catch (NumberFormatException e) {
                System.err.println("3. 验证错误: 无法将值转换为数字进行验证。详细信息: " + e.getMessage());
            }
        } else {
            System.err.println("3. 验证错误: Map中缺少 'start' 或 'material requests' 键。");
        }

        // 示例：如果startValueStr是null，则抛出异常
        String missingKeyExample = parsedMap.get("nonExistentKey");
        if (missingKeyExample == null) {
            System.out.println("3. 示例: 获取一个不存在的键 'nonExistentKey'，结果为 null。");
        }
    }
}