Servlet乱码的处理与urlpattern的配置

问题:在Servlet输出html时很容易出现乱码的问题，如下面的例子所示

1,表单页面

 1 <%@ page contentType="text/html" pageEncoding="GBK" %>
 2 <html>
 3     <head></head>
 4     <body>
 5         <form action="Servlet" method="post">
 6             姓名:<input type="text" name="name"><br />
 7             年龄:<input type="text" name="age"><br />
 8             <input type="submit" value="提交">&nbsp;&nbsp;
 9             <input type="reset" value="重置">            
10         </form>
11     </body>
12 </html>

2,Servlet

　　A:POST提交

package com.gao.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletReceive extends HttpServlet 
{
    public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException
    {
        this.doPost(req,resp);
    }
    public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException
    {
                //如果是post 方法提交 则加入以下两行代码：
        req.setCharacterEncoding("GBK");    
                //此处编码需与JSP页面中的编码格式一致
        resp.setContentType("text/html;charset=GBK");
                //设置页面中的编码格式
                //以上两行代码必须放在resp.getWriter(); 之前
        String name=req.getParameter("name");
        String age=req.getParameter("age");
        PrintWriter pw=resp.getWriter();
        pw.print("<html>");
        pw.print("<head><title>Servlet测试</title></head>");
        pw.print("<body>");
        pw.print("<h1>姓名:"+name+"</h1>");
        pw.print("<h1>年龄:"+age+"</h1>");        
        pw.print("</body>");
        pw.print("</html>");
        
    }
}

　　B:GET提交

 1 package com.gao.servlet;
 2 import java.io.IOException;
 3 import java.io.PrintWriter;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 public class ServletReceive extends HttpServlet 
10 {
11     public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException
12     {    
13         //只需要添加这一句设置页面的编码格式        
14         resp.setContentType("text/html;charset=GBK");    
15         String name=req.getParameter("name");
16         String age=req.getParameter("age");
17         PrintWriter pw=resp.getWriter();
18         pw.print("<html>");
19         pw.print("<head><title>Servlet测试</title></head>");
20         pw.print("<body>");
21         pw.print("<h1>姓名:"+name+"</h1>");
22         pw.print("<h1>年龄:"+age+"</h1>");        
23         pw.print("</body>");
24         pw.print("</html>");
25         
26     }
27     public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException
28     {
29         this.doGet(req,resp);        
30     }
31 }

还需要配置Tomcat中server.xml 中添加"URIEncoding="GBK""，如下所示，否则传过来的参数显示为乱码。

    <Connector port="80" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" 
               URIEncoding="GBK"/>

第二点就是url-pattern的配置问题，Servlet所配置的路径即是JSP页面所在的目录，至于后面的名称必须要与表单提交时所指定的名称一致，一般习惯于以Servlet的类名作为名称(但并不是必须的)。

1 <servlet>
2         <servlet-name>receiveservlet</servlet-name>
3         <servlet-class>com.gao.servlet.ServletReceive</servlet-class>
4     </servlet>
5 
6     <servlet-mapping>
7         <servlet-name>receiveservlet</servlet-name>
8         <url-pattern>/JSPStudy_demo01/Servlet</url-pattern>
9     </servlet-mapping>

此处，JSP页面在JSPStudy_demo01目录中(前面的"/"代表Tomcat中server.xml所配置的虚拟目录)，其后面的名称与表单的action所指定的名称一致既可。