1.新建一个Dynamic Web Project项目，里面新建两个servlet，新建一个jsp，整体的框架结构如下所示： 2.RedirectForwardServlet.java文件的代码如下所示： package servlet;import java.io.IOException;import javax
1.新建一个Dynamic Web Project项目，里面新建两个servlet，新建一个jsp，整体的框架结构如下所示：
2.RedirectForwardServlet.java文件的代码如下所示：
package servlet;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/redirectForwardServlet")
public class RedirectForwardServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding("GBK");
String name = request.getParameter("user");
String password = request.getParameter("pwd");
if (name == null || name.length() == 0) {
response.sendRedirect("login.jsp");
} else if (password == null || password.length() == 0) {
response.sendRedirect("login.jsp");
} else if (name.length() > 0 && password.length() > 0) {
RequestDispatcher dis = request.getRequestDispatcher("showServlet");
dis.forward(request, response);
}
}
}
3.ShowServlet.java文件的代码如下所示：
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/showServlet")
public class ShowServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=GBK");
PrintWriter out = response.getWriter();
request.setCharacterEncoding("GBK");
String name = request.getParameter("user");
String password = request.getParameter("pwd");
out.println("您的用户名是：" + name);
out.println("<br>您的密码是：" + password);
}
}
4.login.jsp文件的代码如下所示：
<%@ 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>login.jsp</title> </head> <body> <form action="redirectForwardServlet" method="post"> <table> <tr> <td>用户名：</td> <td><input type="text" name="user" /></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="pwd" /></td> </tr> <tr> <td><input type="submit" value="提交" /></td> <td><input type="reset" value="重置" /></td> </tr> </table> </form> </body> </html>
5. 在浏览器里面输入http://localhost:8080/Servlet/login.jsp运行之后得到的结果如下所示，里面的中文出现了乱码的现象：