JSON字符串控制台格式化输出

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1.正常情况下返回的json数据格式如下：

{"header":{"transSn":"e33128bb7622462ebfb2cbfcc46baa14","dateTime":"20181002110000","serviceCode":"********","appId":"999999999999","bizId":"000000","version":"1.0","resType":"A","resCode":"SSS000","resMsg":"交易成功(业务附加消息:*****)"},"resBody":{"operator":"lgh","rowNumStart":"1","pageRowNum":"100","pageFlag":"0","totalRowNum":"1","orderFlag":"0","orderField":"","result":[{"flag":"1","riskCode":"00567000","riskName":"567*********","prem":"520.00","amntOrMult":"***","amnt":"200000","polNo":"12177"}]}}

默认都是一行输出，或者在HTML进过一些插件格式化之后才会显示比较美观的格式。那么在Java后台如何进行json格式化输出呢下面直接贴代码。

2.可以封装一个工具类专门转换json格式化：

 /**
     * @param resString
     * @return String
     * @throws
     * @Description 响应数据格式化
     * @author lgh
     * @date 2018/10/29-13:45
     */
    private String responseFormat(String resString){

        StringBuffer jsonForMatStr = new StringBuffer();
        int level = 0;
        for(int index=0;index<resString.length();index++)//将字符串中的字符逐个按行输出
        {
            //获取s中的每个字符
            char c = resString.charAt(index);

            //level大于0并且jsonForMatStr中的最后一个字符为\n,jsonForMatStr加入\t
            if (level > 0  && '\n' == jsonForMatStr.charAt(jsonForMatStr.length() - 1)) {
                jsonForMatStr.append(getLevelStr(level));
            }
            //遇到"{"和"["要增加空格和换行，遇到"}"和"]"要减少空格，以对应，遇到","要换行
            switch (c) {
                case '{':
                case '[':
                    jsonForMatStr.append(c + "\n");
                    level++;
                    break;
                case ',':
                    jsonForMatStr.append(c + "\n");
                    break;
                case '}':
                case ']':
                    jsonForMatStr.append("\n");
                    level--;
                    jsonForMatStr.append(getLevelStr(level));
                    jsonForMatStr.append(c);
                    break;
                default:
                    jsonForMatStr.append(c);
                    break;
            }
        }
        return jsonForMatStr.toString();
    }
    /**
     * @param level
     * @return
     * @throws
     * @author lgh
     * @date 2018/10/29-14:29
     */
    private String getLevelStr(int level) {
        StringBuffer levelStr = new StringBuffer();
        for (int levelI = 0; levelI < level; levelI++) {
            levelStr.append("\t");
        }
        return levelStr.toString();
    }

3.同样的数据输出之后就达到预期效果：

{
	"header":{
		"transSn":"e33128bb7622462ebfb2cbfcc46baa14",
		"dateTime":"20181002110000",
		"serviceCode":"********",
		"appId":"999999999999",
		"bizId":"000000",
		"version":"1.0",
		"resType":"A",
		"resCode":"SSS000",
		"resMsg":"交易成功(业务附加消息:***)"
	},
	"resBody":{
		"operator":"lgh",
		"rowNumStart":"1",
		"pageRowNum":"100",
		"pageFlag":"0",
		"totalRowNum":"1",
		"orderFlag":"0",
		"orderField":"",
		"result":[
			{
				"flag":"1",
				"riskCode":"00567000",
				"riskName":"567 ****",
				"prem":"520.00",
				"amntOrMult":"***",
				"amnt":"200000",
				"polNo":"12177"
			}
		]
	}
}

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