java中JSONArray、JSONObject、List、String之间的转换「建议收藏」

大家好，又见面了，我是你们的朋友全栈君。

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);