form.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>
<a href="${pageContext.request.contextPath}/CharacterServlet?username=小小的太阳&password=123456">Get提交</a>
<form action="${pageContext.request.contextPath}/CharacterServlet" method="post">
姓名：<input type="text" name="username"><br>
密码：<input type="text" name="password"><br>
<input type="submit" value="提交">
<input type="reset" value="重置">
</form>
</body>
</html>
CharacterServlet.java
package zh.servlet.demo;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CharacterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
response.getWriter().write(username+","+password);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
MyRequest.java
package zh.servlet.demo;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class MyRequest extends HttpServletRequestWrapper {
public MyRequest(HttpServletRequest request) {
super(request);
}
@Override
public String getParameter(String name) {
String value = super.getParameter(name);
if (value == null) {
return null;
}
// 解决get请求中文乱码问题
if ("get".equalsIgnoreCase(super.getMethod())) {
try {
value = new String(value.getBytes("iso-8859-1"), "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return value;
}
}
CharacterFilter.java
package zh.filter.demo;
import java.io.IOException;
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.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import zh.servlet.demo.MyRequest;
public class CharacterFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// 强转
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse res = (HttpServletResponse)response;
// 解决响应编码问题
res.setContentType("text/html;charset=utf-8");
// 解决post请求中文乱码问题
req.setCharacterEncoding("utf-8");
// 调包req,对其进行包装，解决get请求中文乱码问题
MyRequest myReq = new MyRequest(req);
chain.doFilter(myReq, response);
}
public void init(FilterConfig fConfig) throws ServletException {
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Javaweb01</display-name>
<servlet>
<servlet-name>CharacterServlet</servlet-name>
<servlet-class>zh.servlet.demo.CharacterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CharacterServlet</servlet-name>
<url-pattern>/CharacterServlet</url-pattern>
</servlet-mapping>
<filter>
<filter-name>CharacterFilter</filter-name>
<filter-class>zh.filter.demo.CharacterFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CharacterFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
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