摘要：这个题目看着挺荒唐的，200已经请求成功了怎么就给改成其他的失败呢？其实这里只是更好的能认识response而已，指不定哪天你能用到呢。

这个代码是我用来返回response用的，这里写一下设置response，主要是体现设置返回状态码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
public class ReturnJson {

    public static void returnJson(HttpServletResponse response) throws Exception{

        CommonResponse commonResponse = CommonResponseUtils.error(
                CommonResponseEnum.ERROE_USER__NO_LOGIN.getCode(),
                errorMsg
        );
        String res = JSONUtil.toJsonStr(commonResponse);

        PrintWriter writer = null;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "*");
        response.setHeader("Access-Control-Allow-Headers","*");
        response.setHeader("Access-Control-Allow-Credentials", "true");

        //HttpServletResponse中有很多已经定义好的状态码，在这这里设置后可以改变前端接收的状态
        response.setStatus(HttpServletResponse.SC_OK);
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        try {
            writer = response.getWriter();
            writer.print(res);

        } catch (IOException e) {

        } finally {
            if (writer != null){
                writer.flush();
                writer.close();
            }
        }
    }

}

response.setStatus(HttpServletResponse.SC_OK);这个方法就是设置返回状态的

其实这个方法是用来在拦截到没有登陆的用户后，返回一段后台定义的错误描述

图片引用