webcontent目錄下的jsp:
<%@?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>
<form?action="Servlet1"?method="post">
<table>
<tr>
<td>姓名：</td>
<td><input?type="text"?name="name"></td>
</tr>
<tr>
<td>ename：</td>
<td><input?type="text"?name="ename"></td>
</tr>
</table>
<button?class="submit">提交</button>
</form>
</body>
</html>
servlet包里面的Servlet1：
package?servlet;
import?java.io.IOException;
import?java.io.PrintWriter;
import?javax.servlet.ServletException;
import?javax.servlet.annotation.WebServlet;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?javax.servlet.http.HttpSession;
import?org.apache.catalina.Session;
/**
?*?Servlet?implementation?class?Servlet1
?*/
@WebServlet("/Servlet1")
public?class?Servlet1?extends?HttpServlet?{
private?static?final?long?serialVersionUID?=?1L;
???????
????/**
?????*?@see?HttpServlet#HttpServlet()
?????*/
????public?Servlet1()?{
????????super();
????????//?TODO?Auto-generated?constructor?stub
????}
/**
?*?@see?HttpServlet#doGet(HttpServletRequest?request,?HttpServletResponse?response)
?*/
protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
//?TODO?Auto-generated?method?stub
//response.setContentType("text/html;charset=utf-8");
// request.setCharacterEncoding("utf-8");
PrintWriter?out=response.getWriter();
String?info=request.getParameter("name");
String?ename=request.getParameter("ename");
out.println(info);
out.println(ename);
out.close();
}
/**
?*?@see?HttpServlet#doPost(HttpServletRequest?request,?HttpServletResponse?response)
?*/
protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
//?TODO?Auto-generated?method?stub
doGet(request,?response);
}
}
filter包里面的：
package?filter;
import?java.io.IOException;
import?java.util.Enumeration;
import?java.util.HashMap;
import?java.util.Map;
import?javax.servlet.Filter;
import?javax.servlet.FilterChain;
import?javax.servlet.FilterConfig;
import?javax.servlet.ServletException;
import?javax.servlet.ServletRequest;
import?javax.servlet.ServletResponse;
import?javax.servlet.annotation.WebFilter;
/**
?*?Servlet?Filter?implementation?class?EncodingFilter
?*/
@WebFilter("/EncodingFilter")
public?class?EncodingFilter?implements?Filter?{
????private?String?encoding;
/**
?*?@see?Filter#destroy()
?*/
public?void?destroy()?{
//?TODO?Auto-generated?method?stub
System.out.println("end?do?the?encoding?filter");
encoding=null;
}
/**
?*?@see?Filter#doFilter(ServletRequest,?ServletResponse,?FilterChain)
?*/
public?void?doFilter(ServletRequest?request,?ServletResponse?response,?FilterChain?chain)?throws?IOException,?ServletException?{
//?TODO?Auto-generated?method?stub
//?place?your?code?here
//?pass?the?request?along?the?filter?chain
System.out.println("before?encoding"+encoding+"filter");
request.setCharacterEncoding(encoding);
response.setContentType("text/html;charset="+encoding);
chain.doFilter(request,?response);
System.out.println("after?encoding"+encoding+"filter");
}
/**
?*?@see?Filter#init(FilterConfig)
?*/
public?void?init(FilterConfig?fConfig)?throws?ServletException?{
//?TODO?Auto-generated?method?stub
System.out.println("begin?do?the?encoding?filter");
encoding=fConfig.getInitParameter("encoding");
}
}
web.xml的配置：
<?xml?version="1.0"?encoding="UTF-8"?>
<web-app?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"?xmlns="http://xmlns.jcp.org/xml/ns/javaee"?xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee?http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"?id="WebApp_ID"?version="3.1">
??<display-name>JavaEETask1</display-name>
??<filter>
?? <filter-name>setCE</filter-name>
?? <filter-class>filter.EncodingFilter</filter-class>
?? <init-param>
?? <param-name>encoding</param-name>
?? <param-value>utf-8</param-value>
?? </init-param>
??</filter>
??<filter-mapping>
?? <filter-name>setCE</filter-name>
?? <url-pattern>/JavaEETask1/Servlet1</url-pattern>
??</filter-mapping>
</web-app>為什么過濾器不起作用??？？求指點
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