eclipse web helloworld

eclipse中创建动态web工程

1. Java Resource中创建包及类HelloWorldAction



类名HelloWorldAction

/*

* Created on 2006-3-23

* TODO

* author:gf

*/

package com.gc.action;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import org.springframework.validation.BindException;

import org.springframework.validation.Errors;

import org.springframework.web.bind.RequestUtils;

import org.springframework.web.bind.ServletRequestBindingException;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.mvc.Controller;

import org.springframework.web.servlet.mvc.SimpleFormController;

import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

import org.springframework.web.servlet.view.RedirectView;

// 实现了controller接口

public class HelloWorldAction implements Controller {

private Logger logger = Logger.getLogger(this.getClass().getName());

private String helloWorld;

private String viewPage;

public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

Map<String, String> model = new HashMap<String, String>();

model.put("helloWorld", getHelloWorld());

return new ModelAndView(getViewPage(), model);

}

//依赖注入要返回的页面

public void setViewPage(String viewPage) {

this.viewPage = viewPage;

}

//获取要返回的页面

public String getViewPage() {

return viewPage;

}

//依赖注入也显示在页面中的文字

public void setHelloWorld(String helloWorld) {

this.helloWorld = helloWorld;

}

//获取要显示在页面中的文字

public String getHelloWorld() {

return helloWorld;

}

}

2.dispatcherServlet-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<!-- urlMapping ：定义一个映射，对helloWorld.do的访问将会映射到 id为helloWorldAction的bean-->

<bean id="urlMapping"

class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

<property name="mappings">

<props>

<prop key="helloWorld.do">helloWorldAction</prop>

</props>

</property>

</bean>

<!-- viewResolver : 定义视图解析器. 通过viewClass属性来指定使用的视图，这里指定 org.springframework.web.servlet.view.InternalResourceView

，表示使用的是jsp/servlet技术 -->

<bean id="viewResolver"

class="org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="viewClass">

<value>org.springframework.web.servlet.view.InternalResourceView</value>

<!--<value>org.springframework.web.servlet.view.JstlView</value> -->

</property>

</bean>

<!-- helloWorldAction : 指定对HelloWorld.do访问时使用的控制器为com.gc.action.HelloWorldAction -->

<bean id="helloWorldAction" class="com.gc.action.HelloWorldAction">

<!-- helloWorld为控制器 通过依赖注入要在页面中显示的内容，这里要在页面中显示HelloWorld -->

<property name="helloWorld">

<value>HelloWorld TTTT</value>

</property>

<!-- viewPage 属性为控制器通过依赖注入要返回的页面，这里要返回的页面是 index.jsp -->

<property name="viewPage">

<value>/WEB-INF/jsp/index.jsp</value>

</property>

</bean>

</beans>

3.web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>

<servlet-name>dispatcherServlet</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<!-- 初始化参数 -->

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/dispatcherServlet-servlet.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<!-- 拦截所有以do结尾的请求 -->

<servlet-mapping>

<servlet-name>dispatcherServlet</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

4.log4j.properties文件放哪里合适？



log4j.rootLogger=DEBUG,stdout,R

log4j.logger.org=ERROR, A1

log4j.logger.com.gc.action=DEBUG,A2

log4j.appender.A1=org.apache.log4j.RollingFileAppender

log4j.appender.A1.File=org.log

log4j.appender.A1.MaxFileSize=500KB

log4j.appender.A1.MaxBackupIndex=50

log4j.appender.A1.Append=true

log4j.appender.A1.layout=org.apache.log4j.PatternLayout

log4j.appender.A1.layout.ConversionPattern=%d{ISO8601} - [%p] [%C{1}] - %m%n

log4j.appender.A2=org.apache.log4j.RollingFileAppender

log4j.appender.A2.File=gc.log

log4j.appender.A2.MaxFileSize=500KB

log4j.appender.A2.MaxBackupIndex=50

log4j.appender.A2.Append=true

log4j.appender.A2.layout=org.apache.log4j.PatternLayout

log4j.appender.A2.layout.ConversionPattern=%d{ISO8601} - [%p] [%C{1}] - %m%n

#--------------------stdout--------------------------------

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.

log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %c - %m%n

#--------------------R--------------------------------

#log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender

#this log file will be stored in web server's /bin directory,modify to your path which want to store.

log4j.appender.R.File=gf.log

#log4j.appender.R.datePattern='.'yyyy-MM-dd-HH-mm

log4j.appender.R.datePattern='.'yyyy-MM-dd

log4j.appender.R.append=true

## Keep one backup file

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %c - %m%n

#[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

5.index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1"%>

<!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=ISO-8859-1">

<title>Test Spring Web</title>

</head>

<% String str = (String) request.getAttribute("helloWorld"); %>

<body>

<h1><%=str %></h1>

</body>

</html>

6.第一天运行程序时，将本机中的tomcat关闭。eclipse中访问http://localhost:8080/spring-test/helloWorld.do，程序正确运行。

第二天再运行，发现一直提示错误，我在任务管理器中删除javaw.exe，仍然无法运行。后将WebContent目录下的index.jsp拷贝到WebContent/WEB-INF/jsp/目录下，程序正确运行了。但是，我第一天运行成功的前提是将WebContent/WEB-INF/jsp/目录下的index.jsp拷贝到WebContent目录下。