今天有个需求，由于调用第三方接口一直调不通，但是又需要先把接口写好供前端调用，于是想到以前写的一个json字符串还原的类。这里做个笔记。

package com.hz.token;import com.google.gson.Gson;import java.util.List;import java.util.Map;/** * 2017/6/26. */public class JsonToStringUtil {    private static StringBuffer sb = new StringBuffer("Map jsonMap = new HashMap();\n");    private JsonToStringUtil() {    }    public static void main(String[] args) {        String s = parseJsonStr(CONTENT);        System.out.println(s);    }    public static String parseJsonStr(String jsonStr) {        Gson gson = new Gson();        Map
     
       map = gson.fromJson(jsonStr, Map.class);        for (Map.Entry
      
        entry : map.entrySet()) {            Object value = entry.getValue();            if (value instanceof String) {                appendStringMap("jsonMap", entry.getKey(), (String) value);            }            if (value instanceof Number) {                appendObjectMap("jsonMap", entry.getKey(), value);            }            if (value instanceof Map) {                appendMapMap(entry.getKey(), (Map) value);                appendObjectMap("jsonMap", entry.getKey(), entry.getKey());            }            if (value instanceof List) {                appendListMap(entry.getKey(), (List) value);                appendObjectMap("jsonMap", entry.getKey(), entry.getKey());            }        }        return sb.toString();    }    private static void appendStringMap(String mapKey, String key, String value) {        sb.append(mapKey).append(".put(\"").append(key).append("\",\"").append(value).append("\");\n");    }    private static void appendObjectMap(String mapKey, String key, Object value) {        sb.append(mapKey).append(".put(\"").append(key).append("\",").append(value).append(");\n");    }    private static void appendMapMap(String subMapKey, Map
       
         subMapValue) {        sb.append("Map ").append(subMapKey).append("= new HashMap();\n");        for (Map.Entry
        
          entry : subMapValue.entrySet()) {            Object value = entry.getValue();            if (value instanceof String) {                appendStringMap(subMapKey, entry.getKey(), (String) value);            }            if (value instanceof Number) {                appendObjectMap(subMapKey, entry.getKey(), value);            }            if (value instanceof Map) {                appendMapMap(entry.getKey(), (Map) value);                appendObjectMap(subMapKey, entry.getKey(), entry.getKey());            }            if (value instanceof List) {                appendListMap(entry.getKey(), (List) value);                appendObjectMap(subMapKey, entry.getKey(), entry.getKey());            }        }    }    private static void appendStringList(String listKey, Object value) {        sb.append(listKey).append(".add(\"").append(value).append("\");\n");    }    private static void appendObjectList(String listKey, Object value) {        sb.append(listKey).append(".add(").append(value).append(");\n");    }    private static void appendListMap(String subListKey, List subListValue) {        sb.append("List ").append(subListKey).append("= new ArrayList();\n");        int i = 1;        for (Object value : subListValue) {            if (value instanceof String) {                appendStringList(subListKey, value);            }            if (value instanceof Number) {                appendObjectList(subListKey, value);            }            if (value instanceof Map) {                String mapName = subListKey + "SubMap" + i;                appendMapMap(mapName, (Map) value);                appendObjectList(subListKey, mapName);            }            if (value instanceof List) {                String listName = subListKey + "SubList" + i;                appendListMap(listName, (List) value);                appendObjectList(subListKey, listName);            }            i++;        }    }    private static String CONTENT = "{\"authCode\":\"drivingLicense\",\"childCommitType\":\"drivingLicenseInfos\",\"custNo\":\"955628\",\"loanCode\":\"carat\",\"mainAuthlog\":\"2016-07-01\",\"mainCardno\":\"沪A12345\",\"mainMotorno\":\"HJ145632\",\"mainRegistdate\":\"2016-07-01\",\"ssAccountId\":\"\"}\n";}
        
       
      
     

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