java输出乱码专题

@Controller
public class ItemCatController {
    @Autowired
    private ItemCatService itemCatService;

    /*@RequestMapping(value="/itemcat/list", 
            produces=MediaType.APPLICATION_JSON_VALUE + ";charset=utf-8")
    @ResponseBody
    public String getItemCatList(String callback) {
        CatResult catResult = itemCatService.getItemCatList();
        //把pojo转换成字符串
        String json = JsonUtils.objectToJson(catResult);
        //拼装返回值
        String result = callback + "(" + json + ");";
        return result;
    }*/


   //springMVC 4.0以上版本可用

    @RequestMapping("/itemcat/list")
    @ResponseBody
    public Object getItemCatList(String callback) {
        CatResult catResult = itemCatService.getItemCatList();
        MappingJacksonValue mappingJacksonValue = new MappingJacksonValue(catResult);
        mappingJacksonValue.setJsonpFunction(callback);
        return mappingJacksonValue;
    }
}

 
在Servlet中出现一个输出中文乱码的问题，已经解。 
 @Override
 public void doPost(HttpServletRequest reqeust, HttpServletResponse response) 
   throws ServletException, IOException { 
    
    //PrintWriter out = response.getWriter();在还没有给response指定编码格式时就获取了他的输出流，所以一直乱码 
  
  reqeust.setCharacterEncoding("utf-8"); 
  response.setContentType("text/html;charset=utf-8"); 
  response.setCharacterEncoding("utf-8"); 
  PrintWriter out = response.getWriter(); //在设置完编码以后在获取输出流就好了。 
  jsonService = new JsonService(); 
  String jsonString = JsonTools.createJsonString("persons", jsonService.getPersonList()); 
  out.println(jsonString); 
  out.flush(); 
  out.close(); 
  } 
 

@Controller
public class ItemController {

    @Autowired
    private ItemService itemService;
    
    @RequestMapping("/item/{itemId}")
    //@ResponseBody
    public void getItemById(@PathVariable Long itemId,HttpServletResponse response) throws IOException {
        TbItem tbItem;
        try {
            tbItem = itemService.getItemById(itemId);
            //如果输出数据中文乱码
            //response.setCharacterEncoding("UTF-8");
            //response.setContentType("text/html;charset=UTF-8");
            response.getWriter().print(tbItem);
        } catch (Exception e) {
            
            e.printStackTrace();
            System.out.println("fdjksdjfsdjkfksjdkfjsjdk");
            
        }
        
        
    }
}