springBoot异常统一处理

采用@ControllerAdvice注解和@ExceptionHandler注解，可以对异常进行统一处理。

1.结构图：

2.pom.xml文件：

<?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>com.didispace</groupId>
    <artifactId>Chapter3-1-6</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>Chapter3-1-6</name>
    <description>Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

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

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

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

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

    </dependencies>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3.配置文件：

server.port=9000

4.index.html

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en">
    <meta charset="UTF-8" />
    <title></title>
</head>
<body>
<h1 th:text="${host}">Hello World</h1>
</body>
</html>

5.error.html

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en">
    <meta charset="UTF-8" />
    <title>统一异常处理</title>
</head>
<body>
<h1>Error Handler</h1>
<div th:text="${url}"></div>
<div th:text="${exception.message}"></div>
</body>
</html>

6.ErrorInfo

package com.didispace.dto;

public class ErrorInfo<T> {

    public static final Integer OK = 0;
    public static final Integer ERROR = 100;

    private Integer code;
    private String message;
    private String url;
    private T data;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public static Integer getOK() {
        return OK;
    }

    public static Integer getERROR() {
        return ERROR;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
    
}

7.myExecption:

package com.didispace.exception;

/**
 * @author 程序猿DD
 * @version 1.0.0
 * @date 16/5/2 上午10:50.
 * @blog http://blog.didispace.com
 */
public class MyException extends Exception {

    public MyException(String message) {
        super(message);
    }

}

8.GlobalExceptionHandler:

package com.didispace.exception;

import com.didispace.dto.ErrorInfo;
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.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(value = Exception.class)
    public ModelAndView defaultErrorHandler(HttpServletRequest req, Exception e) throws Exception {
        ModelAndView mav = new ModelAndView();
        mav.addObject("exception", e);
        mav.addObject("url", req.getRequestURL());
        mav.setViewName("error");
        return mav;
    }

    @ExceptionHandler(value = MyException.class)
    @ResponseBody
    public ErrorInfo<String> jsonErrorHandler(HttpServletRequest req, MyException e) throws Exception {
        ErrorInfo<String> r = new ErrorInfo<>();
        r.setMessage(e.getMessage());
        r.setCode(ErrorInfo.ERROR);
        r.setData("Some Data");
        r.setUrl(req.getRequestURL().toString());
        return r;
    }

}

9.启动项：

package com.didispace;

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

/**
 *
 * @author 程序猿DD
 * @version 1.0.0
 * @blog http://blog.didispace.com
 *
 */
@SpringBootApplication
public class Application {

    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

}

10.controller：

package com.didispace.web;

import com.didispace.exception.MyException;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 *
 * @author 程序猿DD
 * @version 1.0.0
 * @blog http://blog.didispace.com
 *
 */
@Controller
public class HelloController {

    @RequestMapping("/hello")
    public String hello() throws Exception {
        throw new Exception("发生错误");
    }

    @RequestMapping("/json")
    public String json() throws MyException {
        throw new MyException("发生错误2");
    }

    @RequestMapping("/")
    public String index(ModelMap map) {
        map.addAttribute("host", "http://blog.didispace.com");
        return "index";
    }

}