java编译脚本的进阶之路

从零开始

因为工作的原因，需要用java写个简单的测试程序，平时自己工作主要是python，如果因为这去搭建一个eclipse的开发环境总觉得有点小题大作，于是就在配置完jdk的开发环境后，写了下面的一个脚本。

目录结构

build.sh

lib/

*.jar(库文件)

test.java

其中build.sh为编译脚本，lib/路径下面放置的是依赖的第三方提供的jar包文件，test.java即为需要编译的java文件了。

下面贴下我的build.sh脚本的写法，很简单，略带幼稚，望大家轻拍

build.sh

#!/bin/sh
MYCLASS=
for file in lib/*
do
MYCLASS=$MYCLASS:$file
done
export CLASSPATH=$CLASSPATH:$MYCLASS
javac -Xlint *.java

初登正途

又因为机缘巧合，我要用java写一个简单的http服务(好吧，就当时开了一门副业)，上面的脚本显然需要改动了。再贴下新的目录结构吧

build.sh

clear.sh

deploy.sh

lib/

*.jar

src/

resourse/

WebContent/

WEB-INF/

在WEB-INF目录下是classes路径和和web.xml文件，写过servlet的兄弟对这个应该不会陌生。

src路径下就是我们需要编译的java文件，一种简单的组织形式就是跟eclipse那样，按照包名的路径去组织

比如我下面这两个个servlet程序

Log4JTestServlet.java

package com.firstserver.server;

import java.io.IOException;

import javax.servlet.ServletConfig;
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.log4j.Logger;

/**
* Servlet implementation class Log4JTestServlet
*/
public class Log4JTestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Logger logger = Logger.getLogger(Log4JTestServlet.class);

/**
* @see HttpServlet#HttpServlet()
*/
public Log4JTestServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 记录debug级别的信息
logger.debug("This is debug message.");
// 记录info级别的信息
logger.info("This is info message.");
// 记录error级别的信息
logger.error("This is error message.");
}

Log4JInitServlet.java

package com.firstserver.server;

import java.io.File;
import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
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.log4j.BasicConfigurator;
import org.apache.log4j.PropertyConfigurator;

/**
* Servlet implementation class Log4JInitServlet
*/
public class Log4JInitServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Log4JInitServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
System.out.println("Log4JInitServlet 正在初始化 log4j日志设置信息");
String log4jLocation = config.getInitParameter("log4j-properties-location");

ServletContext sc = config.getServletContext();

if (log4jLocation == null) {
System.err.println("*** 没有 log4j-properties-location 初始化的文件, 所以使用 BasicConfigurator初始化");
BasicConfigurator.configure();
} else {
String webAppPath =
4000
sc.getRealPath("/");
String log4jProp = webAppPath + log4jLocation;
File yoMamaYesThisSaysYoMama = new File(log4jProp);
if (yoMamaYesThisSaysYoMama.exists()) {
System.out.println("使用: " + log4jProp+"初始化日志设置信息");
PropertyConfigurator.configure(log4jProp);
} else {
System.err.println("*** " + log4jProp + " 文件没有找到， 所以使用 BasicConfigurator初始化");
BasicConfigurator.configure();
}
}
super.init(config);
}

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

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

}

上面的两个文件放置于src/com/firstserver路径下

lib路径下存放依赖的jar包

build.sh脚本内容

#!/bin/sh
MYCLASS=/usr/tomcat/apache-tomcat-7.0.67/lib/servlet-api.jar
for file in lib/*
do
MYCLASS=$MYCLASS:$file
done
export CLASSPATH=$CLASSPATH:$MYCLASS
javac src/com/firstserver/server/*.java -d WebContent/WEB-INF/classes
cp resource/* WebContent/WEB-INF/classes/com/firstserver/server
cp -R lib WebContent/WEB-INF/

deploy.sh用于在编译完之后，将目标文件拷贝到运行目录

deploy.sh

#!/bin/sh
pushd /usr/tomcat/apache-tomcat-7.0.67/webapps/MyFirstServer
sudo rm -rf WEB-INF/
popd
sudo cp -R WebContent/WEB-INF /usr/tomcat/apache-tomcat-7.0.67/webapps/MyFirstServer
pushd /usr/tomcat/apache-tomcat-7.0.67/bin
sudo ./shutdown.sh
sudo ./startup.sh
popd

web.xml

<?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></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>
<servlet>
<servlet-name>Log4JTestServlet</servlet-name>
<servlet-class>com.firstserver.server.Log4JTestServlet</servlet-class>
</servlet>

<!--用来启动 log4jConfigLocation的servlet -->
<servlet>
<servlet-name>Log4JInitServlet</servlet-name>
<servlet-class>com.firstserver.server.Log4JInitServlet</servlet-class>
<init-param>
<param-name>log4j-properties-location</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>Log4JTestServlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>

</web-app>

走向maven

后来这个项目需要交给qa来发布，他们说一定要是maven的工程，于是我又不得不将这个目录更改，如何搭建maven的开发环境这里就略过了，我当时就是从干java开发的同事那里拷贝了一个maven的包，然后解压，修改了其中的conf路径下的setting文件，改了下localRepository这个配置

build.sh
pom.xml
src/
main/
java/
webapp/
WEB-INF/
web.xml

这里的java路径下面的所放内容跟上面的src是一样的

pom.xml

<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>com.firstserver.server</groupId>
<artifactId>MyFirstServer</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>MyFirstServer Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
</dependencies>
<build>
<finalName>MyFirstServer</finalName>
</build>
</project>

pom文件只是一个例子，本文例子程序所需要的依赖包没有全列在里边。

编译时执行build.sh就可以

build.sh

#!/bin/sh
export MAVEN_HOME=/home/myhome/javacode/apache-maven-3.2.5
export PATH=${MAVEN_HOME}/bin:${PATH}
mvn clean package