过滤器和拦截器之间的区别
过滤器和拦截器之间的区别：
- 过滤器初始化在拦截器之前，在IOC容器bean节点初始化之后。
- 在一个请求生命周期中过滤器只被调用一次，拦截器可被调用多次。
- 过滤器在项目启动时初始化一次，拦截器是通过bean节点初始化在容器中。
创建项目对比拦截器与过滤器区别：
过滤器：
1 /** 2 * @filename MyFilter.Java 3 * @desc 过滤器测试 4 * @blog http://www.cnblogs.com/goodcheap 5 * @author Chinda Wang 6 * @create 2018-01-02 7:45 7 * @version v1.0 8 * @copyright Copyright © 2017 达华信息科技有限公司 版权所有 9 * @modifyhistory 2018-01-02 7:45 10 * @modifyauthor Chinda Wang 11 * @modifydesc 12 */ 13 package com.itdoc.filter; 14 15 import com.itdoc.service.MyService; 16 import org.springframework.beans.factory.annotation.Autowired; 17 import org.springframework.stereotype.Component; 18 19 import javax.servlet.*; 20 import java.io.IOException; 21 22 23 /** 24 * @desc 过滤器测试 25 * @author Chinda Wang 26 * @create 2018-01-02 7:45 27 */ 28 @Component 29 public class MyFilter implements Filter { 30 31 @Autowired 32 private MyService myService; 33 34 /** 35 * Filter 初始化 36 * @param filterConfig 37 * @throws ServletException 38 */ 39 @Override 40 public void init(FilterConfig filterConfig) throws ServletException { 41 System.out.println("初始化Filter!!!"); 42 myService.getFilterInit(); 43 } 44 45 @Override 46 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { 47 System.out.println("Filter doFilter方法!!!"); 48 System.out.println("Filter调用chain.doFilter方法之前!!!"); 49 myService.getFilterDoFilter("之前"); 50 chain.doFilter(request, response); 51 myService.getFilterDoFilter("之后"); 52 System.out.println("Filter调用chain.doFilter方法之后!!!"); 53 } 54 55 @Override 56 public void destroy() { 57 System.out.println("销毁Filter!!"); 58 myService.getFilterDestroy(); 59 } 60 }
拦截器：
1 /** 2 * @filename MyItercepter.Java 3 * @desc 拦截器测试 4 * @blog http://www.cnblogs.com/goodcheap 5 * @author Chinda Wang 6 * @create 2018-01-02 7:46 7 * @version v1.0 8 * @copyright Copyright © 2017 达华信息科技有限公司 版权所有 9 * @modifyhistory 2018-01-02 7:46 10 * @modifyauthor Chinda Wang 11 * @modifydesc 12 */ 13 package com.itdoc.intercepter; 14 15 import com.itdoc.service.MyService; 16 import org.springframework.beans.factory.annotation.Autowired; 17 import org.springframework.stereotype.Component; 18 import org.springframework.web.servlet.HandlerInterceptor; 19 import org.springframework.web.servlet.ModelAndView; 20 21 import javax.servlet.http.HttpServletRequest; 22 import javax.servlet.http.HttpServletResponse; 23 24 /** 25 * @desc 拦截器测试 26 * @author Chinda Wang 27 * @create 2018-01-02 7:46 28 */ 29 @Component 30 public class MyItercepter implements HandlerInterceptor { 31 32 @Autowired 33 private MyService myService; 34 35 /** 36 * 在调用 Controller 之前调用 37 * @param request 38 * @param response 39 * @param obj 40 * @return true 表示继续流程(调用下一个拦截器或处理器) false 表示中断流程, 不在调用其它拦截器或处理器, 需要通过 response 来响应。 41 * @throws Exception 42 */ 43 @Override 44 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception { 45 System.out.println("第一个拦截器调用 preHandler方法!!!"); 46 myService.preHandle(); 47 return true; 48 } 49 50 /** 51 * 在Controller调用之后, DispatcherServlet返回渲染视图之前被调用, 可操作ModelAndView对象对试图进行渲染操作。 52 * 注意: ModelAndView对象有可能为null 53 * @param request 54 * @param response 55 * @param obj 56 * @param modelAndView 57 * @throws Exception 58 */ 59 @Override 60 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object obj, ModelAndView modelAndView) throws Exception { 61 System.out.println("第一个拦截器调用 postHandle方法!!!"); 62 myService.postHandle(); 63 } 64 65 /** 66 * 在视图渲染完毕后调用 67 * @param request 68 * @param response 69 * @param obj 70 * @param e 71 * @throws Exception 72 */ 73 @Override 74 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object obj, Exception e) throws Exception { 75 System.out.println("第一个拦截器调用 afterCompletion方法!!!"); 76 myService.afterCompletion(); 77 } 78 }
1 /** 2 * @filename MyIntercepterScond.Java 3 * @desc 我的第二个拦截器 4 * @blog http://www.cnblogs.com/goodcheap 5 * @author Chinda Wang 6 * @create 2018-01-02 10:16 7 * @version v1.0 8 * @copyright Copyright © 2017 达华信息科技有限公司 版权所有 9 * @modifyhistory 2018-01-02 10:16 10 * @modifyauthor Chinda Wang 11 * @modifydesc 12 */ 13 package com.itdoc.intercepter; 14 15 import org.springframework.stereotype.Component; 16 import org.springframework.web.servlet.HandlerInterceptor; 17 import org.springframework.web.servlet.ModelAndView; 18 19 import javax.servlet.http.HttpServletRequest; 20 import javax.servlet.http.HttpServletResponse; 21 22 /** 23 * @desc 我的第二个拦截器 24 * @author Chinda Wang 25 * @create 2018-01-02 10:16 26 */ 27 @Component 28 public class MyIntercepterScond implements HandlerInterceptor { 29 @Override 30 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception { 31 System.out.println("第二个拦截器调用 preHandle方法!!!"); 32 return true; 33 } 34 35 @Override 36 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object obj, ModelAndView modelAndView) throws Exception { 37 System.out.println("第二个拦截器调用 postHandle方法!!!"); 38 } 39 40 @Override 41 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object obj, Exception e) throws Exception { 42 System.out.println("第二个拦截器调用 afterCompletion方法!!!"); 43 } 44 }
注册配置拦截器：
1 /** 2 * @filename MyIntercepterConfig.Java 3 * @desc 4 * @blog http://www.cnblogs.com/goodcheap 5 * @author Chinda Wang 6 * @create 2018-01-02 8:33 7 * @version v1.0 8 * @copyright Copyright © 2017 达华信息科技有限公司 版权所有 9 * @modifyhistory 2018-01-02 8:33 10 * @modifyauthor Chinda Wang 11 * @modifydesc 12 */ 13 package com.itdoc.configuration; 14 15 import com.itdoc.intercepter.MyIntercepterScond; 16 import com.itdoc.intercepter.MyItercepter; 17 import org.springframework.beans.factory.annotation.Autowired; 18 import org.springframework.stereotype.Component; 19 import org.springframework.web.servlet.config.annotation.InterceptorRegistry; 20 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; 21 22 /** 23 * @desc 24 * @author Chinda Wang 25 * @create 2018-01-02 8:33 26 */ 27 @Component 28 public class MyIntercepterConfig extends WebMvcConfigurerAdapter { 29 30 @Autowired 31 private MyItercepter myItercepter; 32 33 @Autowired 34 private MyIntercepterScond myIntercepterScond; 35 36 /** 37 * 在容器中注册拦截器, 定义拦截器拦截所针对的 uri 38 * @param registry 39 */ 40 @Override 41 public void addInterceptors(InterceptorRegistry registry) { 42 registry.addInterceptor(myItercepter).addPathPatterns("/**"); 43 registry.addInterceptor(myIntercepterScond).addPathPatterns("/**"); 44 super.addInterceptors(registry); 45 } 46 }
项目启动控制台输出：
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. ____ _ __ _ _ 2018-01-02 11:10:51.360 INFO 9780 --- [ main] c.itdoc.FilteritercepterdiffApplication : Starting FilteritercepterdiffApplication on Mr_King-PC with PID 9780 (E:\Learn\fiterItercepter\filteritercepterdiff\target\classes started by Mr_King in E:\Learn\fiterItercepter\filteritercepterdiff) |
请求调用后控制台输出：
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2018-01-02 11:12:27.397 INFO 9780 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet' |
流程图：
git源码 ：https://github.com/wcd19901010/learnRepository/tree/master/filteritercepterdiff
