java輸出亂碼專題

https://blog.csdn.net/liaoYu1887/article/details/82714727（其他）

@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轉換成字符串
        String json = JsonUtils.objectToJson(catResult);
        //拼裝返回值
        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中出現一個輸出中文亂碼的問題，已經解。 
 @Override
 public void doPost(HttpServletRequest reqeust, HttpServletResponse response) 
   throws ServletException, IOException { 
    
    //PrintWriter out = response.getWriter();在還沒有給response指定編碼格式時就獲取了他的輸出流，所以一直亂碼 
  
  response.setContentType("text/html;charset=utf-8"); 
  response.setCharacterEncoding("utf-8"); 
  PrintWriter out = response.getWriter(); //在設置完編碼以后在獲取輸出流就好了。 
  jsonService = new JsonService(); 
  String jsonString = JsonTools.createJsonString("persons", jsonService.getPersonList()); 
  out.println(jsonString); 
  out.flush(); 
  out.close(); 
  } 
 

 同上

@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);
            //如果輸出數據中文亂碼
            //response.setCharacterEncoding("UTF-8");
            //response.setContentType("text/html;charset=UTF-8");
            response.getWriter().print(tbItem);
        } catch (Exception e) {
            
            e.printStackTrace();
            System.out.println("fdjksdjfsdjkfksjdkfjsjdk");
            
        }
        
        
    }
}

 

    @RequestMapping(value="/httpclient/post", method=RequestMethod.POST, 
           produces=MediaType.TEXT_PLAIN_VALUE+";charset=utf-8")
    @ResponseBody
    public String testPost(String username, String password) {
        String result = "username:" + username + "\tpassword:" + password;
        System.out.println(result);
        return "username:" + username + ",password:" + password;
    }

    @Test
    public void doGetWithParam() throws Exception{
        //創建一個httpclient對象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //創建一個uri對象
        URIBuilder uriBuilder = new URIBuilder("http://www.sogou.com/web");
        uriBuilder.addParameter("query", "花千骨");
        HttpGet get = new HttpGet(uriBuilder.build());
        //執行請求
        CloseableHttpResponse response = httpClient.execute(get);
        //取響應的結果
        int statusCode = response.getStatusLine().getStatusCode();
        System.out.println(statusCode);
        HttpEntity entity = response.getEntity();
        String string = EntityUtils.toString(entity, "utf-8");
        System.out.println(string);
        //關閉httpclient
        response.close();
        httpClient.close();
    }