SpringBoot 统一异常处理详解

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>bsea</groupId>
 <artifactId>SpringBootException</artifactId>
 <version>1.0-SNAPSHOT</version>
 <packaging>jar</packaging>
 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.5.14.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
 </parent>

 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <java.version>1.8</java.version>
 </properties>

 <dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>
 </dependencies>

 <build>
  <plugins>
   <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
  </plugins>
 </build>
</project>

package com.zz;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {
 public static void main(String[] args) {
  SpringApplication.run(App.class,args);
 }
}

package com.zz.exception;

public class UserNotExistException extends RuntimeException{
 private static final long serialVersionUID = -1574716826948451793L;

 private String id;

 public UserNotExistException(String id){
  super("user not exist");
  this.id = id;
 }

 public String getId() {
  return id;
 }

 public void setId(String id) {
  this.id = id;
 }
}

package com.zz.handler;

import com.zz.exception.UserNotExistException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import java.util.HashMap;
import java.util.Map;

@ControllerAdvice
public class ControllerExceptionHandler {
 //返回json的错误信息
 @ExceptionHandler(UserNotExistException.class)
 @ResponseBody
 @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
 public Map<String, Object> handleUserNotExistsException(UserNotExistException e) {
  Map<String, Object> map = new HashMap<>();
  map.put("id", e.getId());
  map.put("message", e.getMessage());
  return map;
 }
 //错误以后，跳转到自己定义的错误页面
 @ExceptionHandler(ArithmeticException.class)
 public String handle1(ArithmeticException e) {
  System.out.println("handle1 500*到了**************");
  return "/500.html";
 }
}

package com.zz.controller;

import com.zz.exception.UserNotExistException;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("user")
public class UserController {

 @GetMapping("/{id:\\d+}")
 public void get(@PathVariable String id) {

  throw new UserNotExistException(id);
 }
 @GetMapping("error2")
 public void get2() {
  int a=1/0;
 }
}