SpringBoot配置diff的实战指南

<dependency>
    <groupId>io.github.java-diff-utils</groupId>
    <artifactId>java-diff-utils</artifactId>
    <version>4.12</version>
</dependency>

// 按行分割
List<String> originalLines = Arrays.asList(original.split("\n"));
List<String> revisedLines = Arrays.asList(revised.split("\n"));

// 计算差异
Patch<String> patch = DiffUtils.diff(originalLines, revisedLines);

// 遍历差异
for (AbstractDelta<String> delta : patch.getDeltas()) {
    System.out.println(delta.getType() + " at line " + delta.getSource().getPosition());
    // INSERT: 新增行
    // DELETE: 删除行
    // CHANGE: 修改行
}

for (DiffChange change : diffResult.getChanges()) {
    // 差异头部
    html.append("<div class='diff-header'>")
        .append(String.format("@@ -%d +%d @@", srcLine, tgtLine))
        .append("</div>");

    // 删除的行（红色背景）
    for (String line : change.getOriginalLines()) {
        html.append("<div class='diff-remove'>- ").append(line).append("</div>");
    }

    // 新增的行（绿色背景）
    for (String line : change.getRevisedLines()) {
        html.append("<div class='diff-add'>+ ").append(line).append("</div>");
    }
}

// 解析为 Properties
Properties original = new Properties();
original.load(new ByteArrayInputStream(originalContent.getBytes()));
Properties revised = new Properties();
revised.load(new ByteArrayInputStream(revisedContent.getBytes()));

// 找出删除的 key
Set<String> removedKeys = new HashSet<>(original.stringPropertyNames());
removedKeys.removeAll(revised.stringPropertyNames());

// 找出新增的 key
Set<String> addedKeys = new HashSet<>(revised.stringPropertyNames());
addedKeys.removeAll(original.stringPropertyNames());

// 找出修改的 key
for (String key : original.stringPropertyNames()) {
    if (!Objects.equals(original.getProperty(key), revised.getProperty(key))) {
        modifiedKeys.add(key);
    }
}

@Transactional
public void auditConfigChange(String configId, String newContent, String operator) {
    // 获取原配置
    ConfigEntity oldConfig = configRepository.findById(configId).orElseThrow();

    // 比对差异
    PropertiesDiffResult diff = diffService.compareProperties(
        oldConfig.getContent(), newContent);

    if (!diff.hasChanges()) {
        return; // 无变更，直接返回
    }

    // 保存变更记录
    ConfigChangeLog changeLog = new ConfigChangeLog();
    changeLog.setConfigId(configId);
    changeLog.setOperator(operator);
    changeLog.setDiffResult(JSON.toJSONString(diff));
    configChangeLogRepository.save(changeLog);

    // 发送通知
    notificationService.notifyConfigChange(diff, operator);
}

List<String> normalizeLines(List<String> lines) {
    return lines.stream()
        .map(String::trim)
        .filter(line -> !line.isEmpty())
        .collect(Collectors.toList());
}

// 解析 YAML
ObjectMapper yamlMapper = new ObjectMapper(new YAMLFactory());
JsonNode originalTree = yamlMapper.readTree(originalYaml);
JsonNode revisedTree = yamlMapper.readTree(revisedYaml);

// 转为规范 JSON 字符串后比对
String originalJson = new ObjectMapper().writeValueAsString(originalTree);
String revisedJson = new ObjectMapper().writeValueAsString(revisedTree);
return compareConfigs(originalJson, revisedJson);

https://github.com/yuboon/java-examples/tree/master/springboot-text-diff