java抛出的异常信息如何在页面显示

矫情吗；* 2021-12-24 08:53 263阅读 0赞

### 如何只用java代码，抛出的异常信息在页面显示呢？ ###

1.自定义异常类

public class ProdProcessOrderException extends RuntimeException { 
    	private static final long serialVersionUID = 1L;
    
    	public ProdProcessOrderException(String message) { 
    		super(message);
    	}
    }

2.service层的代码

@Service
    public class GeneralDpPpOrderServiceImpl implements GeneralDpPpOrderService { 
    	public ResponseEntity<byte[]> downLoadExcel(GeneralDpPpOrder generalDpPpOrder) { 
    		//.........
    		//省略代码
    		if (pOrderRouting == null) { 
    			//此处抛出异常
    			throw new ProdProcessOrderException("当前门板流程单没有设置生产工艺.");
    		}
    	}
    }

**service层的抛出异常类**

3.controller层的代码

@RestController
    @RequestMapping("/api/mes/gene-dp-pp-order")
    public class GeneralDpPpOrderController extends ExceptionResponse{  //继承主异常类
    
    	@Autowired
    	private GeneralDpPpOrderService generalDpPpOrderService;
    
    	@RequestMapping(value = "/download-excel", method = RequestMethod.PUT, consumes = "application/json;charset=UTF-8", produces = "application/xls")
    	public ResponseEntity<byte[]> downLoadExcel(@RequestBody GeneralDpPpOrder gdp) { 
    		return generalDpPpOrderService.downLoadExcel(gdp);
    	}
    
    }

**controller类继承主异常类**

4.主异常类代码

public abstract class ExceptionResponse { 
    	@ExceptionHandler(ProdProcessOrderException.class)
    	@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR)
    	public SystemMessage prodProcessOrderException(ProdProcessOrderException e) { 
    		return new SystemMessage(500, e.getMessage());
    	}
    }

**定义的主异常类，里面可以写多个自己定义的异常类**

5.信息类代码

public class SystemMessage { 
    	private int code;
    	private String message;
    
    	public SystemMessage(int code, String message) { 
    		super();
    		this.code = code;
    		this.message = message;
    	}
    
    	public int getCode() { 
    		return code;
    	}
    
    	public void setCode(int code) { 
    		this.code = code;
    	}
    
    	public String getMessage() { 
    		return message;
    	}
    
    	public void setMessage(String message) { 
    		this.message = message;
    	}
    
    }

##### 通过以上五步，就可以把后台抛出的异常信息，在前端页面显示了 #####