使用filter解决get请求中文乱码问题_filter 解析 get 请求-优快云博客

本文主要是使用J2EE过滤器解决get请求中文乱码问题中文.......

1.使用maven添加相关依赖:

 <dependencies>
  	<dependency>
  		<groupId>javax.servlet</groupId>
		<artifactId>javax.servlet-api</artifactId>
		<version>3.0.1</version>
		<scope>provided</scope>
  	</dependency>
  </dependencies>

2.核心过滤器，先通过init方法获取配置参数,然后判断当前是否为get请求,如果是get请求，将request进行包装，否则就不进行包装

public class CharactorFilter implements Filter{
	
	
	private String encoding;
	

	public void destroy() {
		
	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		RequestWrapper rw = null;if(request.getMethod().equals("GET")){
			//只对get请求做包装
			rw = new RequestWrapper(request, encoding);
			//将包装的request作为参数
			chain.doFilter(rw, resp);
		}else{
			chain.doFilter(req, resp);
		}
	}

	/**
	 * web容器启动的时候会调用初始化方法
	 */
	public void init(FilterConfig config) throws ServletException {
		encoding = config.getInitParameter("encoding");
	}
	
}

3.servlet里面没什么，只是读取参数，然后输出

public class ParamServlet extends HttpServlet{

	/**
	 * 
	 */
	private static final long serialVersionUID = -1628437374336667343L;


	@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String name = req.getParameter("name");
		System.out.println("name="+name);
	}
}

4.web.xml文件配置

<filter>
		<filter-name>charactorFilter</filter-name>
		<filter-class>cn.edu.hbut.zw.filter.CharactorFilter</filter-class>
<!-- 设置改filter的初始化参数，即使用什么编码 -->
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	
	<filter-mapping>
		<filter-name>charactorFilter</filter-name>

<!-- 设置这个过滤路径，此时只对paramServlet的访问路径进行过滤 -->
		<servlet-name>paramServlet</servlet-name>
	</filter-mapping>
	
	<servlet>
		<servlet-name>paramServlet</servlet-name>
		<servlet-class>cn.edu.hbut.zw.servlet.ParamServlet</servlet-class>
	</servlet>
	
	<servlet-mapping>

<servlet-name>paramServlet</servlet-name>
		<url-pattern>/paramServlet</url-pattern>
	</servlet-mapping>

5.jsp页面发送get请求

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title>
</head>
<body>
	<a href="paramServlet?name=张三">张三</a>
</body>
</html>

6.使用tomcat进行发布，访问jsp页面，点击即可