在搭建项目框架的时候用的是springboot，想统一处理异常，但是发现404的错误总是捕捉不到，总是返回的是springBoot自带的错误结果信息。
如下是springBoot自带的错误结果信息：
1 {2 "timestamp": 1492063521109,3 "status": 404,4 "error": "Not Found",5 "message": "No message available",6 "path": "/rest11/auth"7 }
百度一波，发现需要配置文件中加上如下配置：
properties格式：
#出现错误时, 直接抛出异常spring.mvc.throw-exception-if-no-handler-found=true#不要为我们工程中的资源文件建立映射spring.resources.add-mappings=false
yml格式：
spring:#出现错误时, 直接抛出异常(便于异常统一处理，否则捕获不到404)mvc:throw-exception-if-no-handler-found: true#不要为我们工程中的资源文件建立映射resources:add-mappings: false
下面是我SpringMVC-config配置代码，里面包含统一异常处理代码，都贴上：
1 package com.qunyi.jifenzhi_zx.core.config; 2 3 import com.alibaba.druid.pool.DruidDataSource; 4 import com.alibaba.druid.support.http.StatViewServlet; 5 import com.alibaba.druid.support.http.WebStatFilter; 6 import com.alibaba.druid.support.spring.stat.BeanTypeAutoProxyCreator; 7 import com.alibaba.druid.support.spring.stat.DruidStatInterceptor; 8 import com.alibaba.fastjson.JSON; 9 import com.alibaba.fastjson.serializer.SerializerFeature; 10 import com.alibaba.fastjson.support.config.FastJsonConfig; 11 import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; 12 import com.qunyi.jifenzhi_zx.core.Const; 13 import com.qunyi.jifenzhi_zx.core.base.exception.ServiceException; 14 import com.qunyi.jifenzhi_zx.core.base.result.ResponseMsg; 15 import com.qunyi.jifenzhi_zx.core.base.result.Result; 16 import org.slf4j.Logger; 17 import org.slf4j.LoggerFactory; 18 import org.springframework.beans.factory.annotation.Value; 19 import org.springframework.boot.web.servlet.FilterRegistrationBean; 20 import org.springframework.boot.web.servlet.ServletListenerRegistrationBean; 21 import org.springframework.boot.web.servlet.ServletRegistrationBean; 22 import org.springframework.context.annotation.Bean; 23 import org.springframework.context.annotation.Configuration; 24 import org.springframework.http.converter.HttpMessageConverter; 25 import org.springframework.web.context.request.RequestContextListener; 26 import org.springframework.web.method.HandlerMethod; 27 import org.springframework.web.servlet.HandlerExceptionResolver; 28 import org.springframework.web.servlet.ModelAndView; 29 import org.springframework.web.servlet.NoHandlerFoundException; 30 import org.springframework.web.servlet.config.annotation.CorsRegistry; 31 import org.springframework.web.servlet.config.annotation.InterceptorRegistry; 32 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; 33 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; 34 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; 35 36 import javax.servlet.http.HttpServletRequest; 37 import javax.servlet.http.HttpServletResponse; 38 import java.io.IOException; 39 import java.nio.charset.Charset; 40 import java.util.List; 41 42 /** 43 * Spring MVC 配置 44 * 45 * @author xujingyang 46 * @date /05/25 47 */ 48 @Configuration 49 public class WebMvcConfigurer extends WebMvcConfigurerAdapter { 50 51private final Logger logger = LoggerFactory.getLogger(WebMvcConfigurer.class); 52@Value("${spring.profiles.active}") 53private String env;//当前激活的配置文件 54 55//使用阿里 FastJson 作为JSON MessageConverter 56@Override 57public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 58 FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter(); 59 FastJsonConfig config = new FastJsonConfig(); 60 config.setSerializerFeatures(SerializerFeature.WriteMapNullValue,//保留空的字段 61 SerializerFeature.WriteNullStringAsEmpty,//String null -> "" 62 SerializerFeature.WriteNullNumberAsZero);//Number null -> 0 63 converter.setFastJsonConfig(config); 64 converter.setDefaultCharset(Charset.forName("UTF-8")); 65 converters.add(converter); 66} 67 68 69//统一异常处理 70@Override 71public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) { 72 exceptionResolvers.add(new HandlerExceptionResolver() { 73 public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception e) { 74 ResponseMsg result; 75 if (e instanceof ServiceException) {//业务失败的异常，如“账号或密码错误” 76 result = new ResponseMsg("501", "业务层出错：" + e.getMessage()); 77 logger.info(e.getMessage()); 78 } else if (e instanceof NoHandlerFoundException) { 79 result = new ResponseMsg("404", "接口 [" + request.getRequestURI() + "] 不存在"); 80 } else { 81 result = new ResponseMsg("500", "接口 [" + request.getRequestURI() + "] 错误，请联系管理员！"); 82 String message; 83 if (handler instanceof HandlerMethod) { 84HandlerMethod handlerMethod = (HandlerMethod) handler; 85message = String.format("接口 [%s] 出现异常，方法：%s.%s，异常摘要：%s", 86 request.getRequestURI(), 87 handlerMethod.getBean().getClass().getName(), 88 handlerMethod.getMethod().getName(), 89 e.getMessage()); 90 } else { 91message = e.getMessage(); 92 } 93 logger.error(message, e); 94 } 95 responseResult(response, result); 96 return new ModelAndView(); 97 } 98 99 });100}101 102//解决跨域问题103@Override104public void addCorsMappings(CorsRegistry registry) {105 registry.addMapping("/**") // **代表所有路径106 .allowedOrigins("*") // allowOrigin指可以通过的ip，*代表所有，可以使用指定的ip，多个的话可以用逗号分隔，默认为*107 .allowedMethods("GET", "POST", "HEAD", "PUT", "DELETE") // 指请求方式 默认为*108 .allowCredentials(false) // 支持证书，默认为true109 .maxAge(3600) // 最大过期时间，默认为-1110 .allowedHeaders("*");111}112 113//添加拦截器114@Override115public void addInterceptors(InterceptorRegistry registry) {116 //接口登录验证拦截器117 if (!"dev".equals(env)) { //开发环境忽略登录验证118 registry.addInterceptor(new HandlerInterceptorAdapter() {119 @Override120 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {121 //验证登录122 Object obj = request.getSession().getAttribute(Const.LOGIN_SESSION_KEY);123 if (obj != null) {124return true;125 } else {126logger.warn("请先登录！==> 请求接口：{}，请求IP：{}，请求参数：{}",127 request.getRequestURI(), getIpAddress(request), JSON.toJSONString(request.getParameterMap()));128 129responseResult(response, new ResponseMsg(Result.SIGNERROR));130return false;131 }132 }133 });134 }135}136 137 138private void responseResult(HttpServletResponse response, ResponseMsg result) {139 response.setCharacterEncoding("UTF-8");140 response.setHeader("Content-type", "application/json;charset=UTF-8");141 response.setStatus(200);142 try {143 response.getWriter().write(JSON.toJSONString(result));144 } catch (IOException ex) {145 logger.error(ex.getMessage());146 }147}148 149private String getIpAddress(HttpServletRequest request) {150 String ip = request.getHeader("x-forwarded-for");151 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {152 ip = request.getHeader("Proxy-Client-IP");153 }154 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {155 ip = request.getHeader("WL-Proxy-Client-IP");156 }157 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {158 ip = request.getHeader("HTTP_CLIENT_IP");159 }160 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {161 ip = request.getHeader("HTTP_X_FORWARDED_FOR");162 }163 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {164 ip = request.getRemoteAddr();165 }166 // 如果是多级代理，那么取第一个ip为客户端ip167 if (ip != null && ip.indexOf(",") != -1) {168 ip = ip.substring(0, ip.indexOf(",")).trim();169 }170 171 return ip;172}173 174 175/**176* druidServlet注册177*/178@Bean179public ServletRegistrationBean druidServletRegistration() {180 ServletRegistrationBean registration = new ServletRegistrationBean(new StatViewServlet());181 registration.addUrlMappings("/druid/*");182 return registration;183}184 185/**186* druid监控 配置URI拦截策略187*188* @return189*/190@Bean191public FilterRegistrationBean druidStatFilter() {192 FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());193 // 添加过滤规则.194 filterRegistrationBean.addUrlPatterns("/*");195 // 添加不需要忽略的格式信息.196 filterRegistrationBean.addInitParameter("exclusions", "/web_frontend/*,*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid,/druid/*,/error,/login*");197 // 用于session监控页面的用户名显示 需要登录后主动将username注入到session里198 filterRegistrationBean.addInitParameter("principalSessionName", "username");199 return filterRegistrationBean;200}201 202 203/**204* druid数据库连接池监控205*/206@Bean207public DruidStatInterceptor druidStatInterceptor() {208 return new DruidStatInterceptor();209}210 211/**212* druid数据库连接池监控213*/214@Bean215public BeanTypeAutoProxyCreator beanTypeAutoProxyCreator() {216 BeanTypeAutoProxyCreator beanTypeAutoProxyCreator = new BeanTypeAutoProxyCreator();217 beanTypeAutoProxyCreator.setTargetBeanType(DruidDataSource.class);218 beanTypeAutoProxyCreator.setInterceptorNames("druidStatInterceptor");219 return beanTypeAutoProxyCreator;220}221 222/**223* RequestContextListener注册224*/225@Bean226public ServletListenerRegistrationBean<RequestContextListener> requestContextListenerRegistration() {227 return new ServletListenerRegistrationBean<>(new RequestContextListener());228}229 230/**231* 将swagger-ui.html 添加 到 resources目录下232*233* @param registry234*/235@Override236public void addResourceHandlers(ResourceHandlerRegistry registry) {237 registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");238 registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");239 registry.addResourceHandler("/web_frontend/**").addResourceLocations("classpath:/web_frontend/");240 241}242 243 }
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至此，所有错误异常都能捕捉到，统一处理了~~
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