Java 读写json格式的文件方法详解

;  electset.setIsReadDB(jo.getString("isReadDB"));   return electset;}//设置属性，并保存public boolean setElect(String path,String sets){   try {    writeFile(path,sets);    return true;   } catch (IOException e) {    // TODO Auto-generated catch block    e.printStackTrace();    return false;   }}//读文件，返回字符串public String ReadFile(String path){    File file = new File(path);    BufferedReader reader = null;    String laststr = "";    try {     //System.out.println("以行为单位读取文件内容，一次读一整行：");     reader = new BufferedReader(new FileReader(file));     String tempString = null;     int line = 1;     //一次读入一行，直到读入null为文件结束     while ((tempString = reader.readLine()) != null) {      //显示行号      System.out.println("line " line ": " tempString);      laststr = laststr tempString;      line ;     }     reader.close();    } catch (IOException e) {     e.printStackTrace();    } finally {     if (reader != null) {      try {       reader.close();      } catch (IOException e1) {      }     }    }    return laststr;}         //把json格式的字符串写到文件public void writeFile(String filePath, String sets) throws IOException {    FileWriter fw = new FileWriter(filePath);    PrintWriter out = new PrintWriter(fw);    out.write(sets);    out.println();    fw.close();    out.close();   } 4.调用，使用（在网站的controller里调用的） //取出json对象public void GetElectSettings(HttpServletRequest request,    HttpServletResponse response) throws Exception {   ElectSet electset=new ElectSet();   String absPath = request.getRealPath("");   String filePath = absPath "publicsetselectSets.json";   electset=businessService.findElectSets(filePath);//这里是调用，大家自己改改，我调用的业务层 的。   JSONArray jsonItems = new JSONArray();   jsonItems.add(electset);   JSONObject jo=new JSONObject();   jo.put("data", jsonItems);   System.out.println(jo);   request.setCharacterEncoding("utf-8");   response.setContentType("application/json;charset=utf-8");   PrintWriter out = response.getWriter();   out.print(jo);} //修改json文件public void ChangeElectSet(HttpServletRequest request,    HttpServletResponse response) throws Exception {&nb