标签：
如何自定义一个HttpServletRequest呢？
比如spring mvc，我们通常写成
@RequestMapping(value = "/helloworld", method = RequestMethod.GET)
public ModelAndView test(HttpServletRequest req, HttpServletResponse res) {
return new ModelAndView("index.jsp");
}
一直在想，能不能不用HttpServletRequest、和HttpServletResponse 呢？最终给我研究出来了下面的写法。
@RequestMapping(value = "/helloworld", method = RequestMethod.GET)
public ModelAndView test(WebRequest req, WebResponse res) {
return new ModelAndView("index.jsp");
}
其实就是filter、拦截器， 着象了。
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
if(!(httpRequest instanceof WebRequest))
{
httpRequest = new WebRequest(httpRequest);
}
HttpServletResponse httpResponse = (HttpServletResponse) response;
if(!(httpResponse instanceof WebResponse))
{
httpResponse = new WebResponse(httpResponse);
}
filterChain.doFilter(httpRequest, httpResponse);
}
原理就是在web.xml里自定义一个拦截器，拦截所有url并把httpservletrequest交给ServletRequest。
private ServletRequest request;
public ServletRequestWrapper(ServletRequest request) {
if(request == null) {
throw new IllegalArgumentException("Request cannot be null");
} else {
this.request = request;
}
}
附上代码好了（各位可以直接粘贴-哈哈-我的最爱）：
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 设置Spring容器加载配置文件路径 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-*.xml</param-value> </context-param> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>interceptAllFilter</filter-name> <filter-class>com.test.filter.RequestFilter</filter-class> </filter> <filter-mapping> <filter-name>interceptAllFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>Test</groupId> <artifactId>test</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>com.test Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.6</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.0.1.RELEASE</version> <type>jar</type> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.0.1.RELEASE</version> <type>jar</type> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.0.1.RELEASE</version> <type>jar</type> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>4.0.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.0.1.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>test</finalName> <pluginManagement> <plugins> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat6-maven-plugin</artifactId> <version>2.2</version> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> </plugin> </plugins> </pluginManagement> </build> </project>
WebRequest.java
/**
* Created by shaoyongyang on 2015/6/5.
*/
package com.test.core;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class WebRequest extends HttpServletRequestWrapper {
public WebRequest(HttpServletRequest request) {
super(request);
}
}
WebResponse.java
/**
* Created by shaoyongyang on 2015/6/5.
*/
package com.test.core;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
public class WebResponse extends HttpServletResponseWrapper {
public WebResponse(HttpServletResponse response) {
super(response);
}
}
RequestFilter.java
/**
* Created by shaoyongyang on 2015/6/5.
*/
package com.test.filter;
import com.test.core.WebRequest;
import com.test.core.WebResponse;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class RequestFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
if(!(httpRequest instanceof WebRequest))
{
httpRequest = new WebRequest(httpRequest);
}
HttpServletResponse httpResponse = (HttpServletResponse) response;
if(!(httpResponse instanceof WebResponse))
{
httpResponse = new WebResponse(httpResponse);
}
filterChain.doFilter(httpRequest, httpResponse);
}
public void destroy() {
}
}
TestController.java
/**
* Created by shaoyongyang on 2015/6/5.
*/
package com.test.action;
import com.alibaba.fastjson.JSONObject;
import com.test.core.WebRequest;
import com.test.core.WebResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
@Controller
public class TestController{
@RequestMapping(value = "/helloworld", method = RequestMethod.GET)
public ModelAndView test(WebRequest req, WebResponse res) {
return new ModelAndView("index.jsp");
}
}
springmvc-servlet.xml 位于WEB-INF
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> <mvc:annotation-driven /> <!-- 自动扫描controller包下的所有类，使其认为spring mvc的控制器 --> <context:component-scan base-package="com.test.action" /> </beans>
代码拷贝的多了，其实关键的还是在上头。在RequestFilter里面。
maven项目可直接 mvn tomcat:run
参考了github上一位外国老兄写的代码、附上地址：https://github.com/surenrao/nsr-bookstore/tree/1a7e56d306819e9939d9d67bd12ee2043e8997ce/java/bookstore-web
如何自定义HttpServletRequest、HttpServletResponse？
标签：
原文地址：http://my.oschina.net/0x4ad/blog/425240
