使用httpServlet方法开发

使用继承HttpServlet方法开发

显示HeeloWorld以及当前日期

默认Doget方式提交

package com.wangzhi.servlet;



import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServlet extends HttpServlet {

    protected void doGet(HttpServletRequest res, HttpServletResponse resp)
            throws ServletException, java.io.IOException {
        resp.getWriter().println("I'm a student");
    }

    protected void doPost(HttpServletRequest res, HttpServletResponse resp)
            throws ServletException, java.io.IOException {
        resp.getWriter().println("I'm a senior student");
    }

}

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相比较post而言安全性低

怎么使用Dopost方式？

<html>
<body>
<form action="/web/MyServlet" method="post">
<input type="String" name="username" value="username"/>
<input type="submit" value="login"/>
</form>
</body>
</html>

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MyServlet.java

package com.wangzhi.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServlet extends HttpServlet {
    
protected void doGet(HttpServletRequest res,HttpServletResponse resp) throws ServletException,
java.io.IOException
{
    resp.getWriter().println("this doGet");
}
protected void doPost(HttpServletRequest res,HttpServletResponse resp) throws ServletException,
java.io.IOException
{
    resp.getWriter().println("This is doPost"+res.getParameter("username"));
}

}

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用eclipse 跑起来第一个servlet程序，

package com.myservlet;

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;

/**
 * Servlet implementation class MyServlet1
 */
@WebServlet("/MyServlet1")
public class MyServlet1 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MyServlet1() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().println("hello,world!"+new java.util.Date().toString());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 合二为一
        this.doGet(request,response);
    }

}

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