第一个JavaWeb工程
这个工程主要用来研究log4j，所以就只有一个页面，希望以后慢慢进步。
java动态生成网页主要使用servlet。把请求拦截下来，处理后返回结果。
这里创建的是一个maven工程。 结构如下：
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" alt="" />
因为是部署在tomcat容器中，所以需要配置 web.xml，主要处理逻辑在HelloWorldController.java，spring-context-config.xml 里面是spring的配置，主要是开包扫描加载controller的注解。
下面是例行的贴代码：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>me.demo</groupId>
<artifactId>test-web-app</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>TestWebApp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 添加spring-context包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 添加spring-tx包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 添加spring-jdbc包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 为了方便进行单元测试，添加spring-test包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!--添加spring-web包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!--添加aspectjweaver包 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.5</version>
</dependency>
<!-- 添加mybatis的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- 添加mybatis与Spring整合的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 添加servlet3.0核心包 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.2-b01</version>
</dependency>
<!-- jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- ODBC14 -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.1.0</version>
</dependency>
<!-- DBCP包 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<!-- 添加druid连接池包 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.12</version>
</dependency> <dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.9</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.4.3</version>
</dependency>
</dependencies>
<build>
<finalName>TestWebApp</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<!-- icon -->
<!-- display-name -->
<display-name>TestWebApp</display-name>
<!-- context-param -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:spring-context-config.xml</param-value>
</context-param>
<!-- filter -->
<!--<servlet>-->
<!--<servlet-name>HelloWorld</servlet-name>-->
<!--<servlet-class>me.demo.controller.HelloWorldController</servlet-class>-->
<!--</servlet>-->
<!--<servlet-mapping>-->
<!--<servlet-name>HelloWorld</servlet-name>-->
<!--<url-pattern>/HelloWorld</url-pattern>-->
<!--</servlet-mapping>-->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<!-- filter-mapping -->
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- listener servlet -->
<listener>
<description>Spring监听器</description>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- servlet -->
<!-- servlet-mapping -->
<!-- session-config -->
<!-- mime-mapping -->
<!-- welcom-file-list -->
<welcome-file-list>
<welcome-file>HelloWorld</welcome-file>
</welcome-file-list>
<!-- error-page -->
<!-- taglib -->
<!-- resource-env-ref -->
<!-- resource-ref -->
<!-- security-constraint -->
<!-- login-config -->
<!-- security-role-->
<!-- env-entry -->
<!-- ejb-ref -->
<!-- ejb-local-ref -->
</web-app>
web.xml
package me.demo.controller; 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; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; /**
* Created by bl05973 on 2015/12/15.
*/
@WebServlet("/HelloWorld")
public class HelloWorldController extends HttpServlet {
Log logger = LogFactory.getLog(HttpServlet.class); public void run(String param) {
System.out.println("[Sysout]"+param);
logger.info("[run] param is" + param);
} public void run() {
run("null");
} public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
run();
request.getRequestDispatcher("/HelloWorld.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String param = request.getParameter("param");
run(param);
request.getRequestDispatcher("/HelloWorld.jsp").forward(request, response);
} public void init() {
logger.info("init ----------------------------------------------------------------------");
}
}
HelloWorldController.java
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 对 me.demo.service 的包扫描 -->
<context:component-scan base-package="me.demo.service" />
</beans>
spring-context-config.xml
<%--
Created by IntelliJ IDEA.
User: bl05973
Date: 2015/12/15
Time: 15:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>HelloWorld</title>
<script type="text/javascript">
<!--
function jump(target) {
window.location.href = target;
}
-->
</script>
</head>
<body>
Hello World!
<form method="post" target="/HelloWorld" >
<input name="param" type="text" />
<input type="submit">
</form>
</body>
</html>
HelloWorld.jsp
运行的主要流程就是HelloWorldController 里面重写了 doGet 和 doPost 方法，tomcat拿到 /HelloWorld 的请求会交给这个controller来处理。然后他处理完后台逻辑，会在最后一句的时候加载 HelloWorld.jsp模板，然后展示出来。
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