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java web demo

2015-09-25 08:55 567 查看

最近想做个简单的Java web，找了些博客之类的资料看，但是没有自己想要的效果

只好自己结合那些资料，自己做了个出来

简单介绍下demo版本的有那些功能，因为只是做个简单的测试，就只实现了取表单里面的数据和简单的成功，失败页面额跳转。

我创建的web项目名字是webProjectTest 注：如果你创建的名字和我的不一样，下面有用到webProjectTest的地方，你对应的位置也修改成你自己创建的web项目的名字

我的success.jsp和fail.jsp和index.jsp是位于同一目录下，success.jsp和fail.jsp中自己随便写了点提示，跳转到success.jsp就显示成功字样，fail.jsp和success.jsp一样，只是提示的是失败字样，没什么特别内容

HelloServlet :

<pre name="code" class="java">package com;

import java.io.IOException;

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

@SuppressWarnings("serial")
public class HelloServlet extends HttpServlet{

@Override
public void destroy() {
System.out.println("Servlet destory");
}

@Override
public void init() throws ServletException {
System.out.println("Servlet init");
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println(req.getSession().getAttribute("name"));
String name = req.getParameter("name"); //获取表单中name字段的值
String password = req.getParameter("password"); //获取表单中password字段的值
System.out.println(password.equals("123")); //简单的过滤下用户名和密码匹配成功跳到成功页面否则跳转到失败页面
if (name.equals("name") && password.equals("123")) {
resp.sendRedirect("./success.jsp"); //success.jsp 和 index.jsp同目录
}
resp.sendRedirect("./success.jsp");
}

@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPut(req, resp);
}
}

HelloFilter：
package com;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class HelloFilter implements Filter{
@Override
public void destroy() {
System.out.println("Filter destroy");
}

@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
chain.doFilter(req, res);

}

@Override
public void init(FilterConfig arg0) throws ServletException {
System.out.println("Filter init");
}

}

web.xml
<pre name="code" class="html"><?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" 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>webProjectTest</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>


<filter>
<filter-name>helloFilter</filter-name>
<filter-class>com.HelloFilter</filter-class> 
</filter>
<filter-mapping>
<filter-name>helloFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>


<servlet>
<servlet-name>helloServelet</servlet-name>
<servlet-class>com.HelloServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>helloServelet</servlet-name>
<url-pattern>/hello</url-pattern> 
</servlet-mapping>
</web-app>

Index.jsp：

<pre name="code" class="javascript"><%@ 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="/webProjectTest/hello" method="get">
姓名 ：<input id="name" type="text" name="name"><br>
密码：<input id="password" type="password" name="password"> <br>
提交<input type="submit">
</form>
</body>
</html>

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标签： java web demo

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