java输出乱码专题

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 

  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();
  }
 

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");

        }

    }
}

    @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{
        //创建一个httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //创建一个uri对象
        URIBuilder uriBuilder = new URIBuilder("http://www.sogou.com/web");
        uriBuilder.addParameter("query", "花千骨");
        HttpGet get = new HttpGet(uriBuilder.build());
        //执行请求
        CloseableHttpResponse response = httpClient.execute(get);
        //取响应的结果
        int statusCode = response.getStatusLine().getStatusCode();
        System.out.println(statusCode);
        HttpEntity entity = response.getEntity();
        String string = EntityUtils.toString(entity, "utf-8");
        System.out.println(string);
        //关闭httpclient
        response.close();
        httpClient.close();
    }