Spring Boot自定义错误处理实战

野性酷女 2021-07-25 02:55 438阅读 0赞

**一 代码位置**

[https://gitee.com/cakin24/code/tree/master/07/Error][https_gitee.com_cakin24_code_tree_master_07_Error]

**二 代码**

package com.example.demo.Controller;
    
    
    import org.springframework.boot.web.servlet.error.ErrorController;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    import java.util.HashMap;
    import java.util.Map;
    
    @RestController
    /*springboot提供了默认的错误映射地址error
    @RequestMapping("${server.error.path:${error.path:/error}}")
    @RequestMapping("/error")
    上面2种写法都可以
    */
    @RequestMapping("/error")
    //继承springboot提供的ErrorController，自定义一个错误处理控制器
    public class TestErrorController implements ErrorController {
        //一定要重写方法,默认返回null就可以,不然报错,因为getErrorPath为空.
        @Override
        public String getErrorPath() {
            return null;
        }
    
    
        //一定要添加url映射,指向error
        @RequestMapping
        public Map<String, Object> handleError() {
            //用Map容器返回信息
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("code", 404);
            map.put("msg", "不存在");
            return map;
        }
        /*这里加一个能正常访问的页面,作为比较
        因为写在一个控制器所以它的访问路径是
        http://localhost:8080/error/ok*/
        @RequestMapping("/ok")
        @ResponseBody
        public Map<String, Object> noError() {
            //用Map容器返回信息
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("code ", 200);
            map.put("msg", "正常，这是测试页面");
    
            return map;
        }
    }

**三 测试**

1 浏览器输入一个不存在的URL： [http://localhost:8080/][http_localhost_8080]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

2 浏览器输入： [http://localhost:8080/error/ok][http_localhost_8080_error_ok]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

[https_gitee.com_cakin24_code_tree_master_07_Error]: https://gitee.com/cakin24/code/tree/master/07/Error
[http_localhost_8080]: http://localhost:8080/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/4d0bfe089a0647dfbf886ebf42b6e9d4.png
[http_localhost_8080_error_ok]: http://localhost:8080/error/ok
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/a4aa02c6473c416b92b12cbbf6dc08f5.png