Java合并json对象

1、引入依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.78</version>
</dependency>

2、合并json对象

/**
     * 合并JSON对象，用source覆盖target，返回覆盖后的JSON对象，
     *
     * @param source JSONObject
     * @param target JSONObject
     * @return JSONObject
     */
    public static JSONObject jsonMerge(JSONObject source, JSONObject target) {
        // 覆盖目标JSON为空，直接返回覆盖源
        if (target == null) {
            return source;
        }

        for (String key : source.keySet()) {
            Object value = source.get(key);
            if (!target.containsKey(key)) {
                target.put(key, value);
            } else {
                if (value instanceof JSONObject) {
                    JSONObject valueJson = (JSONObject) value;
                    JSONObject targetValue = jsonMerge(valueJson, target.getJSONObject(key));
                    target.put(key, targetValue);
                } else if (value instanceof JSONArray) {
                    JSONArray valueArray = (JSONArray) value;
                    for (int i = 0; i < valueArray.size(); i++) {
                        JSONObject obj = (JSONObject) valueArray.get(i);
                        JSONObject targetValue = jsonMerge(obj, (JSONObject) target.getJSONArray(key).get(i));
                        target.getJSONArray(key).set(i, targetValue);
                    }
                } else {
                    target.put(key, value);
                }
            }
        }
        return target;
    }