使用Eclipse创建一个简单的servlet项目

一、通过File->new->others找到Dynamic Web project,创建一个动态的Web项目.

二、配置项目


点击Next，继续配置。

点击Finish配置完成。

再次点击Finish，完成创建。这样就完成创建了一个简单的servlet项目。

以上是一个servlet项目包含的内容。
webContent 是项目根目录。

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三、实现一个简单Form表单提交验证
1.在Java Resources下的src下通过new创建一个包,并在该包下创建一个servlet类

点击Next

点击Next

不用更改以上内容,点击Finish,完成创建servlet.自动生成以下代码.

package com.qcby.myfirstservlet;

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 TestServlet
 */
@WebServlet(description = "This is my first servlet.", urlPatterns = { "/TestServlet" })
public class TestServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        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().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

• doGet()方法用来处理通过get提交的表单信息.
• doPost()方法用来处理通过Post提交的表单信息
• urlPatterns 表示访问该类的路径(当前处于根目录下)

2.在WebContent下创建jsp文件,命名test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>








	账号:${accountErrorString }

	密码:${psdErrorString }

	
${errorString }

3.再创建一个test1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







登录成功

4.修改TestServlet.java

package com.qcby.myfirstservlet;

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 TestServlet
 */
@WebServlet(description = "我的第一个servlet", urlPatterns = { "/TestServlet" })
public class TestServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        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
		String name = request.getParameter("name");
		String sex = request.getParameter("sex");
		String age = request.getParameter("age");
		String str = "{\"name\":\"" + name + "\",\"sex\":\"" + sex + "\",\"age\":" + age + "}";
		response.getWriter().write(str);
//		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
//		doGet(request, response);
		String account = request.getParameter("account");
		String psd = request.getParameter("psd");
		if(account.equals("admin") && psd.equals("123456")) {
			request.getRequestDispatcher("test1.jsp").forward(request, response);
		}else if(account.equals("admin") && !psd.equals("123456")) {
			request.setAttribute("psdErrorString", "password is error");
			request.getRequestDispatcher("test.jsp").forward(request, response);
		}else if(!account.equals("admin") && psd.equals("123456")) {
			request.setAttribute("accountErrorString", "account is error");
			request.getRequestDispatcher("test.jsp").forward(request, response);
		}else {
			request.setAttribute("errorString", "login error");
			request.getRequestDispatcher("test.jsp").forward(request, response);
		}
	}

}

5.以上就完成了一个简单的servlet项目,此时启动Tomcat服务器

点击红色圆圈处的按钮,重启服务器.

6.然后在浏览器地址栏输入http://localhost:8080/myfirstservlet/test.jsp

点击提交

此时浏览器地址栏变成http://localhost:8080/myfirstservlet/TestServlet

7.输入admin 123456 登录,将会显示提交成功.