1 package fengke.servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5
6 import javax.servlet.ServletException;
7 import javax.servlet.http.HttpServlet;
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpServletResponse;
10 /**
11 * 解决乱码问题的方式
12 * @author 锋客
13 *
14 */
15 public class Character extends HttpServlet {
16
17 public void doGet(HttpServletRequest request, HttpServletResponse response)
18 throws ServletException, IOException {
19
20 response.setContentType("text/html");
21 this.doPost(request, response);
22 }
23
24
25 public void doPost(HttpServletRequest request, HttpServletResponse response)
26 throws ServletException, IOException {
27
28 response.setContentType("text/html");
29 /*1.采用设置字符集的方式
30 * request.setCharacterEncoding("utf-8");
31 */
32 /*2.设置过滤器 ====CoreFilter.java
33 * 配置web.xml
34 */
35 /*
36 * 3.采用转码的方式
37 * String s = new String(request.getParameter("c").getBytes("ISO8859-1"),"UTF-8");
38 */
39
40 String s = request.getParameter("c");
41 System.out.println(s);
42 }
43
44
45 }
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2
3 <%
4 String path = request.getContextPath();
5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6 %>
7
8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9 <html>
10 <head>
11 <base href="<%=basePath%>">
12
13 <title>My JSP 'index.jsp' starting page</title>
14 <meta http-equiv="pragma" content="no-cache">
15 <meta http-equiv="cache-control" content="no-cache">
16 <meta http-equiv="expires" content="0">
17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18 <meta http-equiv="description" content="This is my page">
19 <!--
20 <link rel="stylesheet" type="text/css" href="styles.css">
21 -->
22 </head>
23 <!-- 解决乱码问题 -->
24 <body>
25 <table>
26 <form action="Character" method="post" >
27 <tr>
28 <td><input type="text" name="c" value="中国"></td>
29 <td><input type="submit" value="提交"></td>
30 </tr>
31 </form>
32 </table>
33 </body>
34 </html>
1 <?xml version="1.0" encoding="UTF-8"?>
2 <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">
3 <display-name>Character</display-name>
4 <servlet>
5 <description>This is the description of my J2EE component</description>
6 <display-name>This is the display name of my J2EE component</display-name>
7 <servlet-name>Character</servlet-name>
8 <servlet-class>fengke.servlet.Character</servlet-class>
9 </servlet>
10
11 <servlet-mapping>
12 <servlet-name>Character</servlet-name>
13 <url-pattern>/Character</url-pattern>
14 </servlet-mapping>
15 <welcome-file-list>
16 <welcome-file>index.html</welcome-file>
17 <welcome-file>index.htm</welcome-file>
18 <welcome-file>index.jsp</welcome-file>
19 <welcome-file>default.html</welcome-file>
20 <welcome-file>default.htm</welcome-file>
21 <welcome-file>default.jsp</welcome-file>
22 </welcome-file-list>
23 <!--
24 <filter>
25 <filter-name>encodingFilter</filter-name>
26 <filter-class>fengke.filter.CoreFilter</filter-class>
27 <init-param>
28 <param-name>encoding</param-name>
29 <param-value>utf-8</param-value>
30 </init-param>
31 </filter>
32
33 <filter-mapping>
34 <filter-name>encodingFilter</filter-name>
35 <url-pattern>/*</url-pattern>
36 </filter-mapping>
37 -->
38 </web-app>
package fengke.filter;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
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.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
//过滤器处理表单传到servlet的乱码问题
public class CoreFilter implements Filter{
//自写一个request换掉原来的request,重写里面的getParemeter方法，可以设置编码
class MyRequest extends HttpServletRequestWrapper{
@Override
public String getParameter(String param) {
String value = null;
try {
//post
super.setCharacterEncoding(encoding);//把编码转换为encoding
value = super.getParameter(param);
if(super.getMethod().equalsIgnoreCase("GET")){
if(value!=null){
value = new String(value.getBytes("iso8859-1"),encoding);
}
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return value;
}
public MyRequest(HttpServletRequest request) {
super(request);
}
}
protected String encoding=null;
public void destroy() { //销毁
// TODO Auto-generated method stub
this.encoding=null;
}
//对编码问题进行转换
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset="+encoding);
//过滤未登录用户
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
String path=req.getServletPath();
String param=req.getQueryString();
if(path!=null){
path=path+"?"+param;//全请求路径
}
if(path.endsWith("myAddress")||path.endsWith("myJingDong")||path.indexOf("myShouCang")!=-1||path.endsWith("updateUser")||path.indexOf("showOrder")!=-1||path.indexOf("showValidOrder")!=-1||path.indexOf("showCancelOrder")!=-1||path.indexOf("fillOrder")!=-1){
HttpSession session = req.getSession();
String userName = (String) session.getAttribute("username");
if(userName == null){
session.setAttribute("url", path.replaceFirst("/", ""));
System.out.println(session.getAttribute("url"));
resp.sendRedirect("user.do?op=loginAction");
return;
}
}
//把过滤器给下一个过滤器或资源处理器
chain.doFilter(new MyRequest((HttpServletRequest) request), response);
}
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.encoding=filterConfig.getInitParameter("encoding");//encoding在web.xml中指定
}
}
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