Spring 中的 404 错误（java config / no web.xml）

虽然没有我想的那么清楚，但这是一种工作版本，至少可以为错误页面提供一些自定义。这是第一种方法，但希望可以帮助其他人。处理的异常列表并不广泛，但主要解决 404 错误 ( NoHandlerFoundException) 和其他典型错误，例如InternalServerErrorExceptionand NullPointerException，尝试在最后捕获所有异常，并为所有其他是 a 的错误提供通用错误Exception)。请注意，这不包括与例如 JSTL 模板中的错误语法相关的其他异常（org.apache.jasper.*; 显然无法在此处捕获的异常）。这些是源库的相关更改和添加：CustomSimpleMappingExceptionResolver.java（提供通用异常，但记录详细信息）package ...;import java.util.ArrayList;import java.util.Arrays;import java.util.Date;import javax.ws.rs.InternalServerErrorException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.http.HttpStatus;import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.NoHandlerFoundException;public class CustomSimpleMappingExceptionResolver extends SimpleMappingExceptionResolver {    public CustomSimpleMappingExceptionResolver() {        // Turn logging on by default        setWarnLogCategory(getClass().getName());    }    @Override    public String buildLogMessage(Exception e, HttpServletRequest req) {        return "MVC exception: " + e.getLocalizedMessage();    }    @Override    protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response,                                              Object handler, Exception ex) {        // Log exception        ex.printStackTrace();        String exceptionCause = ex.toString();        String exceptionType = ex.getClass().getCanonicalName();        // Get the ModelAndView to use        ModelAndView mav = super.doResolveException(request, response, handler, ex);        // Make more information available to the view - note that SimpleMappingExceptionResolver adds the exception already        mav.addObject("url", request.getRequestURL());        mav.addObject("timestamp", new Date());        ArrayList<String> exceptions404 = new ArrayList<String>(                Arrays.asList(                        NoHandlerFoundException.class.getName()                        )        );        ArrayList<String> exceptions500 = new ArrayList<String>(                Arrays.asList(                        InternalServerErrorException.class.getName(),                        NullPointerException.class.getName()                        )        );        String userExceptionDetail = ex.toString();        String errorHuman = "";        String errorTech = "";        if (exceptions404.contains(exceptionType)) {            errorHuman = "We cannot find the page you are looking for";            errorTech = "Page not found";            userExceptionDetail = String.format("The page %s cannot be found", request.getRequestURL());            mav.setViewName("/error/404");            mav.addObject("status", HttpStatus.NOT_FOUND.value());        } else if (exceptions500.contains(exceptionType)) {            errorHuman = "We cannot currently serve the page you request";            errorTech = "Internal error";            userExceptionDetail = "The current page refuses to load due to an internal error";            mav.setViewName("/error/500");            mav.addObject("status", HttpStatus.INTERNAL_SERVER_ERROR.value());        } else {            errorHuman = "We cannot serve the current page";            errorTech = "General error";            userExceptionDetail = "A generic error prevents from serving the page";            mav.setViewName("/error/generic");            mav.addObject("status", response.getStatus());        }        Exception userException = new Exception(userExceptionDetail);        mav.addObject("error_human", errorHuman);        mav.addObject("error_tech", errorTech);        mav.addObject("exception", userException);        return mav;    }}WebAppConfig.java（将自定义异常解析器注册为异常处理程序）package ...;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import org.springframework.context.annotation.Scope;import org.springframework.context.annotation.ScopedProxyMode;import org.springframework.core.env.Environment;import org.springframework.core.Ordered;import org.springframework.http.HttpStatus;import org.springframework.transaction.annotation.EnableTransactionManagement;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.NoHandlerFoundException;import org.springframework.web.servlet.view.InternalResourceViewResolver;import java.lang.ClassNotFoundException;import java.lang.NullPointerException;import javax.annotation.Resource;import javax.ws.rs.InternalServerErrorException;import java.util.Properties;@Configuration@ComponentScan("...")@EnableWebMvc@EnableTransactionManagement@PropertySource("classpath:application.properties")public class WebAppConfig extends WebMvcConfigurerAdapter {    @Resource    private Environment env;    // ...    @Bean    HandlerExceptionResolver customExceptionResolver () {        CustomSimpleMappingExceptionResolver resolver = new CustomSimpleMappingExceptionResolver();        Properties mappings = new Properties();        // Mapping Spring internal error NoHandlerFoundException to a view name        mappings.setProperty(NoHandlerFoundException.class.getName(), "/error/404");        mappings.setProperty(InternalServerErrorException.class.getName(), "/error/500");        mappings.setProperty(NullPointerException.class.getName(), "/error/500");        mappings.setProperty(ClassNotFoundException.class.getName(), "/error/500");        mappings.setProperty(Exception.class.getName(), "/error/generic");        resolver.setExceptionMappings(mappings);        // Set specific HTTP codes        resolver.addStatusCode("404", HttpStatus.NOT_FOUND.value());        resolver.addStatusCode("500", HttpStatus.INTERNAL_SERVER_ERROR.value());        resolver.setDefaultErrorView("/error/generic");        resolver.setDefaultStatusCode(200);        // This resolver will be processed before the default ones        resolver.setOrder(Ordered.HIGHEST_PRECEDENCE);        resolver.setExceptionAttribute("exception");        return resolver;    }    // ...    @Bean    public InternalResourceViewResolver setupViewResolver() {        InternalResourceViewResolver resolver = new InternalResourceViewResolver();        resolver.setPrefix("/WEB-INF/views");        resolver.setSuffix(".jsp");        resolver.setExposeContextBeansAsAttributes(true);        return resolver;    }    @Override    public void addViewControllers(ViewControllerRegistry registry) {        super.addViewControllers(registry);    }}Initializer.java（添加dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);；可能不需要）package ...;import org.springframework.web.WebApplicationInitializer;import org.springframework.web.context.ContextLoaderListener;import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;import org.springframework.web.servlet.DispatcherServlet;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletRegistration;public class Initializer implements WebApplicationInitializer {    public void onStartup(ServletContext servletContext) throws ServletException {        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();        ctx.register(WebAppConfig.class);        servletContext.addListener(new ContextLoaderListener(ctx));        ctx.setServletContext(servletContext);        DispatcherServlet dispatcherServlet = new DispatcherServlet(ctx);        dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);        // Add the dispatcher servlet mapping manually and make it initialize automatically        ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher", dispatcherServlet);        servlet.addMapping("/");        servlet.addMapping("*.png");        servlet.addMapping("*.jpg");        servlet.addMapping("*.css");        servlet.addMapping("*.js");        servlet.addMapping("*.txt");        servlet.setLoadOnStartup(1);        // ...    }}与错误类相关的视图和标签的结构：    src/main/webapp/WEB-INF/    ├── tags    │   └── error.tag    └── views        ├── error        │   ├── 404.jsp        │   ├── 500.jsp        └────── generic.jspsrc/main/webapp/WEB-INF/tags/error.tag<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE html><head>    <title>Error page</title></head><body><div class="container">    <h3><c:out value="${error_human}" /></h3>    <p><br/><br/></p>    <div class="panel panel-primary">        <div class="panel-heading">            <c:out value="${error_tech}" />        </div>        <div class="panel-body">            <p><c:out value="${exception_message}" /></p>        </div>    </div></div></body></html>src/main/webapp/WEB-INF/views/error/404.jsp<%@ page language="java" contentType="text/html; charset=utf-8"         pageEncoding="utf-8" isErrorPage="true" %><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib tagdir="/WEB-INF/tags/" prefix="g" %><c:set var = "error_human" scope = "session" value = "We cannot find the page you are looking for"/><c:set var = "error_tech" scope = "session" value = "Page not found"/><c:set var = "exception_message" scope = "session" value = "The current page cannot be found"/><g:error />src/main/webapp/WEB-INF/views/error/500.jsp<%@ page language="java" contentType="text/html; charset=utf-8"         pageEncoding="utf-8" isErrorPage="true" %><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib tagdir="/WEB-INF/tags/" prefix="g" %><c:set var = "error_human" scope = "session" value = "We cannot currently serve the page you request"/><c:set var = "error_tech" scope = "session" value = "Internal error"/><c:set var = "exception_message" scope = "session" value = "The current page refuses to load due to an internal error"/><g:error />src/main/webapp/WEB-INF/views/error/generic.jsp<%@ page language="java" contentType="text/html; charset=utf-8"         pageEncoding="utf-8" isErrorPage="true" %><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib tagdir="/WEB-INF/tags/" prefix="g" %><c:set var = "error_human" scope = "session" value = "We cannot serve the current page"/><c:set var = "error_tech" scope = "session" value = "General error"/><c:set var = "exception_message" scope = "session" value = "A generic error prevents from serving the page"/><g:error />

Spring 中的 404 错误（java config / no web.xml）

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