正在装载数据…… 今天开始动手学习Servlet，从最基本的HelloWord程序开始，在Servlet中用 String str = request.getParamete(String paramete_name); 获得从一个JSP页面传递过来的POST对象时，页面显示乱码; 查询javadocs文档和一些jsp Servlet资料，终于解决问题，解决这个问题共花费了两个多小时 同时也弄明白了关于Servlet的基本语法，下面是今天晚上的研究成果（以源代码贴出）： public class HelloWorld extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(”text/html;charset=GB2312″);//设置Servlet页面类型和编码
PrintWriter out = response.getWriter();//获取输出对象
//设置request对象的编码方式，包含post和get两种方式
request.setCharacterEncoding(”GB2312″);
String username = request.getParameter(”username”);//获取参数username
ServletConfig config = getServletConfig();//创建读取web.xml文件的对象
if(username == null){
//获取Servlet中该Servlet的初始化参数username
username = config.getInitParameter(”username”);
}
/* 输出html*/
out.println(”<html>”);
out.println(”<head>”);
out.println(”<meta http-equiv=\”Content-Type\” content=\”text/html; charset=GB2312\”>”);
out.println(”<title>Servlet HelloWorld</title>”);
out.println(”</head>”);
out.println(”<body>”);
out.println(”<h1>Servlet HelloWorld at ” + request.getContextPath () + “</h1>”);
out.println(”<h1>Hello!你的名字是1： “+username+”</h1>”);
out.println(”</body>”);
out.println(”</html>”);
out.close();
}
// <editor-fold defaultstate=”collapsed” desc=”HttpServlet methods. Click on the + sign on the left to edit the code.”>
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return “Short description”;
}
// </editor-fold>
} 配置文件web.xml <?xml version=”1.0″ encoding=”UTF-8″?>//xml编码
<web-app version=”2.4″ xmlns=”http://java.sun.com/xml/ns/j2ee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd”>
<servlet>
<servlet-name>HelloWorld</servlet-name>//Servlet名字，唯一标识
<servlet-class>com.wlmzfx.servlet.HelloWorld</servlet-class>//Servlet类库路径
<init-param>//初试化参数
<description>this is a test servlet</description>
<param-name>username</param-name>
<param-value>wang</param-value>
</init-param>
</servlet>
<servlet-mapping>//url映射，指定url路径为“/HelloWord”时调用“HelloWord”Servlet
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
<servlet-mapping>//url映射，指定所有以.do为后缀的文件调用“HelloWord”Servlet
<servlet-name>HelloWorld</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<session-config>//指定session的过期时间，30表示30分钟后过期
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>//指定欢迎页（首页文件名）
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
</web-app> 本文来源：http://blog.csdn.net/wlmzfx/archive/2007/09/09/1778312.aspx
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