ubuntu源码安装jdk8

最近学习java，想起来没有在Ubuntu上使用过

因此想安装下环境，并在Ubuntu上试用MPXJ读取mpp文件

1.安装

下载jdk8

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

新建目录

mkdir  /usr/lib/jvm

解压

tar -zxvf jdk-8u211-linux-x64.tar.gz -C /usr/lib/jvm

修改环境变量

vim ~/.bashrc

追加

#set oracle jdk environment
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_211
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

使生效

 source ~/.bashrc

2.测试

（1）是否安装成功

（2）Hello.java

public class Hello {
    private Integer aa = 1;
    public String ss = "sss";
    public static void main(String[] args) {   
    System.out.println("Hello Java");
    }
}

 javac Hello.java

java Hello

javap Hello

3.用MPXJ读取mpp文件

在http://www.mpxj.org/官网MPXJ in Java，进入下载页

添加MPXJ的包

在/usr/lib/jvm/jdk1.8.0_211/jre/lib/ext下添加下面的jar包（我的安装目录在/usr/lib/jvm/jdk1.8.0_211下）

mpxj.jar
commons-collections4-4.1.jar
poi-3.17.jar
rtfparserkit-1.10.0.jar

在/www/javatest下添加mpxjtest.java

 import net.sf.mpxj.mpp.*;
 import net.sf.mpxj.MPXJException;
 import net.sf.mpxj.Resource; 
 import net.sf.mpxj.ResourceAssignment;
 import net.sf.mpxj.Task; 
 import net.sf.mpxj.ProjectFile;
 import java.util.List; 
 import java.io.*; 
 public class mpxjtest { 
    public static void main(String[] args) throws MPXJException {
        File file = new File("/www/javatest/aa.mpp"); 
        MPPReader mppRead = new MPPReader(); 
        ProjectFile pf = mppRead.read(file); 
        List tasks = pf.getAllTasks(); 
        mpxjtest mt = new mpxjtest(); 
        System.out.println("总任务数: " + tasks.size()); 
        System.out.println("ID|任务名|资源|开始时间|结束时间|完成百分比"); 
        for (int i = 1; i < tasks.size(); i++) { 
            System.out.println(((Task) tasks.get(i)).getUniqueID() + "|" + ((Task) tasks.get(i)).getName()); 
        } 
    } 
    public String getResource(Task task) { 
        StringBuffer buf = new StringBuffer(); 
        List assignments = task.getResourceAssignments(); 
        for (int i = 0; i < assignments.size(); i++) {
            ResourceAssignment assignment = (ResourceAssignment) assignments .get(i);
            Resource resource = assignment.getResource(); 
            if (resource != null) {
                buf.append(resource.getName()).append(" "); 
            } 
        }
        return buf.toString(); 
    } 
}

运行

javac mpxjtest.java
java mpxjtest

结果

 说明：

　　还可以通过ppa(源) 方式安装

add-apt-repository ppa:webupd8team/java
apt-get update
apt-get install oracle-java8-installer