java报错信息在页面显示的方法：首先自定义异常类；然后在service层的抛出异常类，controller类继承主异常类；接着定义的主异常类，里面可以写多个自己定义的异常类；最后完成信息类代码。

java报错信息在页面显示的方法：

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

@Servicepublic 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@Autowiredprivate 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

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