json在后台封装后，返回中文乱码

清疚 2022-06-01 07:00 336阅读 0赞

#### Spring版本：3.\*RELEASE ####

这里统一转换为utf-8  
因为低版本的spring缺少许多方法，所以不能用produces

##### 方案一、将json数据写入PrintWriter 流中 #####

@RequestMapping(value="/upload")
        public  void upload( HttpServletResponse response) throws Exception{
    
                //创建Json对象
                JSONObject jsonObject = new JSONObject();
                jsonObject.put("msg","hello");
                jsonObject.put("msg2","world");
                try {
               response.setContentType("text/html;charset=utf-8");         
                PrintWriter out = response.getWriter(); //获取写入对象 
                out.print(json); //将json数据写入流中 
                out.flush();  
                out.close();
                  } catch (IOException e) {
                     e.printStackTrace();
                } //获取写入对象 
    
        }

##### 方案二、将json数据写入ServletOutputStream 流中 #####

@RequestMapping(value="/upload")
        public  void upload(@RequestParam("file") MultipartFile file,HttpServletRequest request, HttpServletResponse response) throws Exception{
             //创建Json对象
                JSONObject jsonObject = new JSONObject();
                jsonObject.put("msg","hello");
                jsonObject.put("msg2","world");
                try {
    
                //要将json对象转换为string类型
                    String json = jsonObject.toString();
                     ServletOutputStream os = response.getOutputStream(); //获取输出流 
                     os.write((json.getBytes(Charset.forName("utf-8")))); //将json数据写入流中 
                     os.flush(); 
                     os.close();    
                } catch (IOException e) {
                     e.printStackTrace();
                } //获取写入对象 
    
        }

#### 更高版本的spring可以利用设置 @RequestMapping 的 produces 参数 ####

@RequestMapping(value="/upload",produces = "text/html;charset=UTF-8")
    @ResponseBody 
        public  jsonObject upload(@RequestParam("file") MultipartFile file,HttpServletRequest request, HttpServletResponse response) throws Exception{
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
    
                //创建Json对象
                JSONObject jsonObject = new JSONObject();
                jsonObject.put("msg","hello");
                jsonObject.put("msg2","world");
                return jsonObject ;
    
        }

\[参考链接\]：[Spring MVC3返回JSON数据中文乱码问题解决][Spring MVC3_JSON]

[Spring MVC3_JSON]: http://blog.csdn.net/zht666/article/details/8695908