How to display java error information on the page

How to display Java error information on the page: first customize the exception class; then throw the exception class in the service layer, and the controller class inherits the main exception class; then define the main exception class, in which you can write multiple Self-defined exception class; finally complete the information class code.

How to display java error information on the page:

1. Custom exception class

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

2. Code of the service layer

@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.");
}
}
}

Exception class thrown by the service layer

3. Code of the controller layer

@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);
}

The controller class inherits the main exception class

4. Main exception class code

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

defines the main exception class, in which you can write multiple self-defined exception classes

5. Information class code

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;
}

Through the above five steps, the exception information thrown by the background can be displayed on the front-end page

Related learning recommendations:java basic tutorial

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