springboot框架的全局异常处理方案详解

系统框架搭建的前期过程中，为了约束代码规范，我们会对一些通用功能做一些处理，比如声明一些系统公用错误类、封装通用返回结果、统一异常处理等，这样做的优势是团队开发过程中能够形成统一的代码规范，增强代码可读性，同时又便于后期代码维护。本文主要介绍下框架中异常的处理：

1.声明全局异常处理类，并添加@controlleradvice和@restcontroller注解
代码如下：

@controlleradvice
@restcontroller
public class globalexceptionhandler {
	
	private final logger logger = logger.getlogger(globalexceptionhandler.class);

	//空指针异常
  @exceptionhandler(nullpointerexception.class)
  public map<string, object> nullpointer(nullpointerexception e,httpservletrequest req){
    logger.error(e.getmessage());
		e.printstacktrace();
    return resultobject.newresultobj(errorcode.nullpointer);
  }
	
	//io异常
	@exceptionhandler(ioexception.class,httpservletrequest req, httpservletresponse res)
  public map<string, object> ioexception(ioexception e){
  	 logger.error(e.getmessage());
		 e.printstacktrace();
     return resultobject.newresultobj(errorcode.ioexception);
  }
  
	
	//权限不足异常	
	@exceptionhandler(unauthorizedexception.class)
	public map<string, object> unauth(httpservletrequest req, httpservletresponse res){
		return resultobject.newresultobj(errorcode.unauth);
	}
	
	//未登录异常	
	@exceptionhandler(authorizationexception.class)
	public map<string, object> unlogin(httpservletrequest req, httpservletresponse res){
		return resultobject.newresultobj(errorcode.notlogin);
	}
	
	//其它异常
	@exceptionhandler(exception.class)
	public map<string, object> error(exception e,httpservletrequest req, httpservletresponse res){
		logger.error(e.getmessage());
		e.printstacktrace();
		return resultobject.newresultobj(errorcode.system);
	}
	
}

2.声明系统通用错误处理类

/**
 * 系统通用错误处理类
 */
public class errorcode {

  //返回码
  private int code = 0;
	
  //描述信息
  private string errmsg = "success";
	
  //成功
  public static final errorcode success 					  = new errorcode(0,"success");
  public static final errorcode params 					  = new errorcode(100000,"参数错误");
  public static final errorcode system 					  = new errorcode(100001,"系统错误");
	public static final errorcode unlogin 					  = new errorcode(100002,"未登录");
  public static final errorcode unauth 					  = new errorcode(100003,"权限错误");
	public static final errorcode nullpointer 					= new errorcode(100004,"空指针错误");
	public static final errorcode ioexception 					= new errorcode(100005,"io错误");
  public static final errorcode upload_fail 					= new errorcode(100006,"文件上传失败");
  public static final errorcode repeat 					  = new errorcode(100007,"数据已存在");

  public errorcode() {}

  @override
  public string tostring() {
    return string.format("{\"errmsg\": \"%s\", \"code\": %d}", errmsg, code);
  }

  public int getcode() {
    return code;
  }

  public errorcode setcode(int code) {
    this.code = code;
    return this;
  }

  public string geterrmsg() {
    return errmsg;
  }

  public errorcode seterrmsg(string errmsg) {
    this.errmsg = errmsg;
    return this;
  }

  public errorcode(int code, string errmsg) {
    this.code = code;
    this.errmsg = errmsg;
  }

}

3.声明全局异常处理类中的结果返回类

import java.util.hashmap;
import java.util.map;
import javax.servlet.http.httpservletresponse;
import com.xxx.errorcode;//此处引用自己errorcode类所在的包路径
import org.json.jsonobject;

public class resultobject {	
	
	/**
	 * 输出错误信息
	 * @param errorcode
	 */
	public static map<string, object> newresultobj(errorcode errorcode){
		map<string, object> obj = new hashmap<string, object>();
		obj.put("code", errorcode.getcode());
		obj.put("errmsg", errorcode.geterrmsg());
		return obj;
	}
	
	/**
	 * 输出带数据的成功信息
	 * @param data
	 */
	public static map<string, object> newresultobj(object data){
		map<string, object> obj = new hashmap<string, object>();
		obj.put("code", errorcode.success.getcode());
		obj.put("errmsg", errorcode.success.geterrmsg());
		if(null != data){
			obj.put("data", data);
		}
		return obj;		
	}
	
	/**
	 * 输出带数据的错误信息
	 * @param errorcode
	 * @param data
	 */
	public static map<string, object> newresultobj(errorcode errorcode, object data){
		map<string, object> obj = new hashmap<string, object>();
		obj.put("code", errorcode.getcode());
		obj.put("errmsg", errorcode.geterrmsg());
		if(null != data){
			obj.put("data", data);
		}
		return obj;				
	}
	
	
	/**
	 * 输出结果
	 */
	public static void outputresult(httpservletresponse response, errorcode errorcode){
		try {
			jsonobject json = new jsonobject();
			json.put("code", errorcode.getcode());
			json.put("errmsg", errorcode.geterrmsg());
			
			response.setcharacterencoding("utf-8");
			response.setcontenttype("application/json;charset=utf-8");
			response.getwriter().write(json.tostring());
		} catch (exception e1) {
		}
	}
}

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