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。三、实现一个简单Form表单提交...
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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。
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"%>
<!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>Insert title here</title>
</head>
<body>
<form action="TestServlet" method="post">
账号:<input type="text" name="account" />${accountErrorString }<br>
密码:<input type="password" name="psd" />${psdErrorString }<br>
<input type="submit" value="提交" /><br>${errorString }
</form>
</body>
</html>
3.再创建一个test1.jsp
<%@ 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>Insert title here</title>
</head>
<body>
<h1>登录成功</h1>
</body>
</html>
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.
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