一个简单的jsp+servlet+javabean

时间：2021-07-28 19:04:37

问题来自这里：

http://bbs.csdn.net/topics/390700523?page=1#post-396671837


他那里的代码servlet的运行目测是通过onload的location指定的

servlet代码：

package user.yourservlet;
import user.yourbean.Lefttopbean;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Lefttop extends HttpServlet{
    public void init(ServletConfig config) throws ServletException{
        super.init(config);
    }
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
        Lefttopbean lt=new Lefttopbean();
        String information="测试";
        lt.setInformation(information);
        System.out.println(lt.getInformation());
        request.getSession().setAttribute("lefttopbean",lt);
        response.sendRedirect("lefttop.jsp");
    }
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
        System.out.println("here");
        doPost(request, response);
    }
}

javabean对应的java类 

package user.yourbean;
public class Lefttopbean {
    String information=null;
    public String getInformation(){
        return information;
    }
    public void setInformation(String w){
        information=w;
    }
}

web.xml 

<servlet>
<servlet-name>lefttop</servlet-name>
<servlet-class>user.yourservlet.Lefttop</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>lefttop</servlet-name>
<url-pattern>/lefttop</url-pattern>
</servlet-mapping>

lefttop.jsp文件 

<%@ page contentType="text/html; charset=utf-8" %>
<jsp:useBean id="lefttopbean" scope="session" class="user.yourbean.Lefttopbean"/>
<html>
<body>
<h3><jsp:getProperty name="lefttopbean" property="information" /></h3>
</body>
</html>

运行的时候直接通过访问servlet的url-pattern，在通过servlet内部跳转到jsp文件就可以准确显示了。

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