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在实例中区别转发与重定向--可以自己复制粘贴看看效果

2017-09-07 20:59 260 查看

重定向到主页，浏览器提交方式

response.sendRedirect("name");

转发，服务器跳转方式

request.getRequestDispatcher("name").forward(request, response)

1.先建立一个web项目，然后在WebRoot中创建两个.jsp文件，代码如下

---login.jsp文件

<body>

<form action="login" method="get">

用户<input type="text" name="username"><br>

密码<input type="password" name="userpsw"><br>

<input type="submit" value="提交">

</form>



</body>

---index.jsp文件

<body>

欢迎进入index.jsp页面

request.setCharacterEncoding("utf-8");

String username=request.getParameter("username");

String userpsw=request.getParameter("userpsw");

out.print("你的登录名是："+username+"<br>");

out.print("你的密码是："+userpsw+"<br>");

out.print(new Date().toLocaleString());

<%!

int i=2;

%>

<%

out.print(i);

%>

<br>

<br>

<%

out.print("aaa");

%>



<%@ include file="123.html" %>

</body>

2.接着在src中创建一个.java类，代码如下

---SxtServlet.java

package com.sxt;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.jsp.PageContext;

public class SxtServlet extends HttpServlet{
public void init(ServletConfig config) throws ServletException {

}

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8" );

String username=request.getParameter("username");
String userpsw=request.getParameter("userpsw");
System.out.println(username+" "+userpsw);
if(username!=null && username.equals("admin") && userpsw!=null && userpsw.equals("123")){

System.out.println( request.getRequestURI());

//response.sendRedirect( request.getRequestURI()+"/index.jsp");\

//request.getRequestDispatcher("index.jsp").forward(request, response);
// request.getRequestDispatcher("index.jsp").forward(request, response);
response.sendRedirect(request.getContextPath()+"/index.jsp");
}
else{
PrintWriter out=response.getWriter();
out.println("登录失败");
response.sendRedirect("index.jsp");
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("进入了post");

}

public void destroy() {

}

}

3.最后在WebRoot下的WEB-INF的web.xml中编写如下代码(每次只要打开web.xml文件，都要刷新tomcat)

--web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 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">

<display-name>jsp3</display-name>

<servlet>

<servlet-name>SxtServlet</servlet-name>

<servlet-class>com.sxt.SxtServlet</servlet-class>

</servlet>



<servlet-mapping>

<servlet-name>SxtServlet</servlet-name>

<url-pattern>/login</url-pattern>

</servlet-mapping>



</web-app>

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