用Java对JSON字符串进行格式化输出

ゝ一纸荒年。 2022-06-16 01:16 377阅读 0赞

工作中进行http相关接口测试时经常会收到返回的json数据，因为没有格式化输入到控制台后看起来很不直观。

早上写了一个小工具类，对这JSON串进行格式化输出，代替System.out.print

/** * 格式化输入工具类 * * @author lizhgb * @date 2015-10-14 * @Modified 2017-04-28 * */
    public final class FormatUtil { 
    
        /** * 打印输入到控制台 * * @param jsonStr * @author lizhgb * @Date 2015-10-14 下午1:17:22 */
        public static void printJson(String jsonStr) {
            System.out.println(formatJson(jsonStr));
        }
    
        /** * 格式化 * * @param jsonStr * @return * @author lizhgb * @Date 2015-10-14 下午1:17:35 * @Modified 2017-04-28 下午8:55:35 */
        public static String formatJson(String jsonStr) {
            if (null == jsonStr || "".equals(jsonStr))
                return "";
            StringBuilder sb = new StringBuilder();
            char last = '\0';
            char current = '\0';
            int indent = 0;
            boolean isInQuotationMarks = false;
            for (int i = 0; i < jsonStr.length(); i++) {
                last = current;
                current = jsonStr.charAt(i);
                switch (current) {
                case '"':
                                    if (last != '\\'){
                        isInQuotationMarks = !isInQuotationMarks;
                                    }
                    sb.append(current);
                    break;
                case '{':
                case '[':
                    sb.append(current);
                    if (!isInQuotationMarks) {
                        sb.append('\n');
                        indent++;
                        addIndentBlank(sb, indent);
                    }
                    break;
                case '}':
                case ']':
                    if (!isInQuotationMarks) {
                        sb.append('\n');
                        indent--;
                        addIndentBlank(sb, indent);
                    }
                    sb.append(current);
                    break;
                case ',':
                    sb.append(current);
                    if (last != '\\' && !isInQuotationMarks) {
                        sb.append('\n');
                        addIndentBlank(sb, indent);
                    }
                    break;
                default:
                    sb.append(current);
                }
            }
    
            return sb.toString();
        }
    
        /** * 添加space * * @param sb * @param indent * @author lizhgb * @Date 2015-10-14 上午10:38:04 */
        private static void addIndentBlank(StringBuilder sb, int indent) {
            for (int i = 0; i < indent; i++) {
                sb.append('\t');
            }
        }
    }

测试：

@Test
        public void jsonPrintTest2() { 
    
            String str = "{ \"content\":\"this is the msg content.\",\"tousers\":\"user1|user2\",\"msgtype\":\"texturl\",\"appkey\":\"test\",\"domain\":\"test\","
                    + "\"system\":{ \"wechat\":{ \"safe\":\"1\"}},\"texturl\":{ \"urltype\":\"0\",\"user1\":{ \"spStatus\":\"user01\",\"workid\":\"work01\"},\"user2\":{ \"spStatus\":\"user02\",\"workid\":\"work02\"}}}";
            FormatUtil.printJson(str);
        }

输出：

{
        "content":"this is the msg content.",
        "tousers":"user1|user2",
        "msgtype":"texturl",
        "appkey":"test",
        "domain":"test",
        "system":{ "wechat":{ "safe":"1" } },
        "texturl":{ "urltype":"0", "user1":{ "spStatus":"user01", "workid":"work01" }, "user2":{ "spStatus":"user02", "workid":"work02" } } }

转自：

https://my.oschina.net/jasonli0102/blog/517052?p={
       {page}}#comment-list