关于java中JSONArray、JSONObject、List、String之间的转换

一、JASSONArray转为JSONObject

   JSONArray result_type = new JSONArray();

   StringBuffer cdsIdxType = new StringBuffer();

   cdsIdxType.append(" select id from table_type ");

   result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());

  JSONObject jsonObject = (JSONObject) result_type.get(i);

二、JASONArray转为List

  JSONArray result_type = new JSONArray();


   StringBuffer cdsIdxType = new StringBuffer();


   cdsIdxType.append(" select id from table_type ");


   result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());


   ArrayList list_type = new ArrayList();


   for (int i = 0; i < result_type.size(); i++) {


    JSONObject jsonObject = (JSONObject) result_type.get(i);


    list_type.add(jsonObject.get("id"));


   }

三、JSONArray转为String

   JSONArray result_type = new JSONArray();


   StringBuffer cdsIdxType = new StringBuffer();


    cdsIdxType.append(" select id from table_type ");


   result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());


   String typeAll = "";


   ArrayList list_type = new ArrayList();


   for (int i = 0; i < result_type.size(); i++) {


    JSONObject jsonObject = (JSONObject) result_type.get(i);


    list_type.add(jsonObject.get("id"));
   
   }


   for(int j=0;j<list_type.size();j++){


    typeAll = typeAll + "'" + list_type.get(j) + "'" + ",";


   }


   typeAll = typeAll.substring(0, typeAll.length() -1);

四、String转换为ArrayList

 String tablecode = request.getParameter("tablecode");


  tablecode = tablecode.substring(1, tablecode.length()-1).replace("\"", "");


  String[] list = tablecode.split(",");


  ArrayList tables = new ArrayList();


  for(int i=0; i<list.length; i++){


   tables.add(list[i]);


  }

五.String转JSONObject

String jsonMese = "{"语文":"88","数学":"78","计算机":"99"}";

JSONObject myJson = JSONObject.fromObject(jsonMese);

六.String转JSONArray

String jsonMessage = "[{'num':'成绩', '外语':88, '历史':65, '地理':99, 'object':{'aaa':'1111','bbb':'2222','cccc':'3333'}}," + "{'num':'兴趣', '外语':28, '历史':45, '地理':19, 'object':{'aaa':'11a11','bbb':'2222','cccc':'3333'}}," + "{'num':'爱好', '外语':48, '历史':62, '地理':39, 'object':{'aaa':'11c11','bbb':'2222','cccc':'3333'}}]";

JSONArray myJsonArray = JSONArray.fromObject(jsonMessage);

七.String转数组

String string = "a,b,c"; String [] stringArr= string.split(","); //注意分隔符是需要转译

如果是"abc"这种字符串,就直接

String string = "abc" ; char [] stringArr = string.toCharArray(); //注意返回值是char数组 如果要返回byte数组就直接使用getBytes方法就ok了

String string = "abc" ; byte [] stringArr = string.getBytes();

八、数组转String

char[] data={a,b,c};

String s=new String(data);