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..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 = ;
    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..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 = ; 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 = ; 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