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访问Servlet的方式介绍

服务器中转发访问Servlet

浏览器地址栏输入URL访问Servlet

重定向访问Servlet

jsp对应的网页上发出请求(重点)
超链接访问
window.location.href访问
 

伪连接
事件
表单提交(get,post)
理其它客户端访问

下面介绍浏览器地址栏输入URL访问Servlet的方法

代码如下：

一：TestServlet.java

package com.fs.test1;


import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.fs.test.TestService;
import com.fs.test.TestServiceInf;


@WebServlet("/test.do")
public class TestServlet extends HttpServlet {
private TestService testService = new TestServiceInf();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/web15_visitorServletWithParm3/test.do?username=wgr&pwd=123
//接收请求参数  username, pwd
String username = req.getParameter("username").trim();
String pwd = req.getParameter("pwd").trim();
//登陆
boolean flag = testService.login(username, pwd);
if(flag == true) {//登陆成功
//转发到main.jsp
req.getRequestDispatcher("/main.jsp").forward(req, resp);
}else {//登陆失败
//转发到error.jsp
req.getRequestDispatcher("/error.jsp").forward(req, resp);
}
}
}

二：TestService.java

package com.fs.test;


public interface TestService {
public boolean login(String uesrname,String pwd);
}

三：TestServiceInfS.java

package com.fs.test;


public class TestServiceInf implements TestService{


@Override
public boolean login(String username, String pwd) {
/*如果username和pwd正确返回true，否则返回false*/
if("wgr".equals(username) && "123".equals(pwd)){
return true;
}
return false;
}
此处省略main.jsp和error.jsp两个简单的jsp代码，自己可写

四：在浏览器中输入：http://localhost:8080/Java7.6/test.do?username=wgr&&pwd=123

在实际应用中此方法可用于黑客跳过网站js验证，直接进入网站。

 

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