Hadoop2.8.5详细教程（十）界面版HDFS控制程序

本篇文章旨在完成一个Swing界面版的HDFS控制程序：

1.新建一个testHDFS3项目

2.因为我们上一个项目是使用分层开发，所以本次HDFSService类还和上个项目保持一样，只需要修改HDFSView：

package view;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import service.HDFSService;

public class HDFSView {
    
    
	String local;
	String hdfs;
	// 本地文件的文件选择器、按钮、显示文件路径标签
	JFileChooser fileChooser;
	JButton localBtn;
	JLabel localText;
	JButton uploadBtn;
	JButton downBtn;
	JTextField hDFSText;

	public void initView() {
    
    
		JFrame frame = new JFrame();
		frame.setSize(500, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLocationRelativeTo(null);
		JPanel mainPanel = (JPanel) frame.getContentPane();
		BoxLayout layout = new BoxLayout(mainPanel, BoxLayout.Y_AXIS);
		mainPanel.setLayout(layout);
		JPanel panel1 = new JPanel();
		panel1.setLayout(new FlowLayout(FlowLayout.LEFT));
		JPanel panel2 = new JPanel();
		panel2.setLayout(new FlowLayout(FlowLayout.LEFT));
		JPanel panel3 = new JPanel();
		panel3.setLayout(new FlowLayout(FlowLayout.LEFT));
		mainPanel.add(panel1);
		mainPanel.add(panel2);
		mainPanel.add(panel3);

		JLabel localLabel = new JLabel("本地文件:");
		//文件选择器
		fileChooser = new JFileChooser();
		fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
		localBtn = new JButton("选择文件");
		localBtn.setPreferredSize(new Dimension(120, 30));

		localText = new JLabel("无");
		panel1.add(localLabel);
		panel1.add(localBtn);
		panel1.add(localText);
		JLabel hDFSLabel = new JLabel("HDFS文件:");

		hDFSText = new JTextField();
		hDFSText.setPreferredSize(new Dimension(120, 30));

		panel2.add(hDFSLabel);
		panel2.add(hDFSText);

		uploadBtn = new JButton("上传");
		uploadBtn.setPreferredSize(new Dimension(120, 30));
		downBtn = new JButton("下载");
		downBtn.setPreferredSize(new Dimension(120, 30));
		panel3.add(uploadBtn);
		panel3.add(downBtn);
		frame.setVisible(true);
	}

	public void setFunction() {
    
    
		HDFSService service = new HDFSService();
		service.init();
		// 设置本地文件按钮可以选择本地文件
		localBtn.addActionListener(new ActionListener() {
    
    
			@Override
			public void actionPerformed(ActionEvent e) {
    
    
				int option = fileChooser.showOpenDialog(null);
				if (option == JFileChooser.APPROVE_OPTION) {
    
    
					local = fileChooser.getSelectedFile().getAbsolutePath();
					localText.setText(local);
				}
			}
		});
		// 上传按钮
		uploadBtn.addActionListener(new ActionListener() {
    
    
			@Override
			public void actionPerformed(ActionEvent e) {
    
    
				hdfs = hDFSText.getText();
				service.put(local, hdfs);

			}
		});
		// 下载按钮
		downBtn.addActionListener(new ActionListener() {
    
    
			@Override
			public void actionPerformed(ActionEvent e) {
    
    
				hdfs = hDFSText.getText();
				service.put(local, hdfs);

			}
		});
	}

	public static void main(String[] args) {
    
    
		HDFSView hv = new HDFSView();
		hv.initView();
		hv.setFunction();
	}
}

service包下的HDFSService.java没变：

package service;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HDFSService {
    
    
	FileSystem fs;

	public HDFSService() {
    
    
		try {
    
    
			URI uri = new URI("hdfs://192.168.150.21:9000");
			Configuration conf = new Configuration();
			// conf.set("dfs.replication", "2");
			// conf.set("dfs.block.size", "64m");
			conf.set("fs.hdfs.impl", "org.apache.hadoop.hdfs.DistributedFileSystem");
			fs = FileSystem.get(uri, conf, "root");
		} catch (IOException e) {
    
    
			e.printStackTrace();
		} catch (InterruptedException e) {
    
    
			e.printStackTrace();
		} catch (URISyntaxException e) {
    
    
			e.printStackTrace();
		}
	}

	public boolean put(String local, String hdfs) {
    
    
		boolean flag = false;
		try {
    
    
			fs.copyFromLocalFile(new Path(local), new Path(hdfs));
			flag = true;
		} catch (IllegalArgumentException e) {
    
    
			e.printStackTrace();
		} catch (IOException e) {
    
    
			e.printStackTrace();
		}
		return flag;
	}

	// 下载需要配置hadoop_home
	public boolean get(String local, String hdfs) {
    
    
		boolean flag = false;

		try {
    
    
			fs.copyToLocalFile(new Path(hdfs), new Path(local));
			flag = true;
		} catch (IllegalArgumentException e) {
    
    
			e.printStackTrace();
		} catch (IOException e) {
    
    
			e.printStackTrace();
		}
		return flag;

	}
}

3.运行
windows：

linux：