Spring MVC @ExceptionHandler Example【转】
自定义类:
CustomGenericException.java package com.mkyong.web.exception; public class CustomGenericException extends RuntimeException { private static final long serialVersionUID = 1L; private String errCode; private String errMsg; public String getErrCode() { return errCode; } public void setErrCode(String errCode) { this.errCode = errCode; } public String getErrMsg() { return errMsg; } public void setErrMsg(String errMsg) { this.errMsg = errMsg; } public CustomGenericException(String errCode, String errMsg) { this.errCode = errCode; this.errMsg = errMsg; } }
3. Spring Controller
A Spring controller, review the execution-flows below :
- If user provide a
/error
request, it throws “CustomGenericException”, and thehandleCustomException()
method will be fired. - If user provide a
/io-error
request, it throws “IOException”, and thehandleAllException()
method will be fired.
MainController.java package com.mkyong.web.controller; import java.io.IOException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.servlet.ModelAndView; import com.mkyong.web.exception.CustomGenericException; @Controller public class MainController { @RequestMapping(value = "/{type:.+}", method = RequestMethod.GET) public ModelAndView getPages(@PathVariable("type") String type) throws Exception { if ("error".equals(type)) { // go handleCustomException throw new CustomGenericException("E888", "This is custom message"); } else if ("io-error".equals(type)) { // go handleAllException throw new IOException(); } else { return new ModelAndView("index").addObject("msg", type); } } @ExceptionHandler(CustomGenericException.class) public ModelAndView handleCustomException(CustomGenericException ex) { ModelAndView model = new ModelAndView("error/generic_error"); model.addObject("errCode", ex.getErrCode()); model.addObject("errMsg", ex.getErrMsg()); return model; } @ExceptionHandler(Exception.class) public ModelAndView handleAllException(Exception ex) { ModelAndView model = new ModelAndView("error/generic_error"); model.addObject("errMsg", "this is Exception.class"); return model; } }
4. JSP Pages
pages/index.jsp <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <html> <body> <h2>Spring MVC @ExceptionHandler Example</h2> <c:if test="${not empty msg}"> <h2>${msg}</h2> </c:if> </body> </html>
pages/error/generic_error.jsp <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <html> <body> <c:if test="${not empty errCode}"> <h1>${errCode} : System Errors</h1> </c:if> <c:if test="${empty errCode}"> <h1>System Errors</h1> </c:if> <c:if test="${not empty errMsg}"> <h2>${errMsg}</h2> </c:if> </body> </html>
转:https://mkyong.com/spring-mvc/spring-mvc-exceptionhandler-example/
道法自然