Maven pom 版本升級腳本

簡述：

每一次發佈版本全量升級太慢，Java實現一個全量pom版本替換的程序

輸入參數：

- 原項目的根路徑

- 老的tag版本

- 新的tag版本

注意點：

使用內存從文件讀取字符串，然後老-新tag替換，在替換前需要清空源文件

這裏使用FileChannel的成員方法truncate(0), 清空文件 

fc.truncate(0);

代碼：

ReplaceRobot.java

package com.anialy.test.pomreplace;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileFilter;
import java.io.FileReader;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.List;


public class ReplaceRobot {

	public static void main(String[] args) {
		new ReplaceRobot(
		/*原文件夾*/	"C:/Users/Administrator/Desktop/workspace_tca_web/tca-v2"
		/*原tag*/	,"20140926H"
		/*新tag*/	,"20140926I-SNAPSHOT"
		).process();
	}
	
	
	private String basePath;
	
	private String prevVersion;
	
	private String curVersion;
	
	private String replaceFileName = "pom.xml";

	private List<String> relativeFiles = new ArrayList<String>();
	
	public ReplaceRobot(String basePath,
			String prevVersion, String curVersion) {
		this.basePath = basePath;
		this.prevVersion = prevVersion;
		this.curVersion = curVersion;
		
		// 相對路徑存放
		relativeFiles.add("");
		
		relativeFiles.add("/components");
		relativeFiles.add("/plugins");
		relativeFiles.add("/infrastucture");
		relativeFiles.add("/server");
		
		relativeFiles.add("/components/circle");
		relativeFiles.add("/components/component-system");
		relativeFiles.add("/components/core");
		relativeFiles.add("/components/invoker-service");
		relativeFiles.add("/components/mail-service");
		
		relativeFiles.add("/plugins/plugin-common");
		relativeFiles.add("/plugins/plugin-operation");
		relativeFiles.add("/plugins/plugin-resource");
		relativeFiles.add("/plugins/plugin-topic");
		relativeFiles.add("/plugins/plugin-train");
		
	}
	
	
	public void process(){
		for(String filePath : relativeFiles){
			// pom文件的上級目錄
			File file = new File(basePath + filePath);
			// 抓取所有pom文件
			File[] files = file.listFiles(new FileFilter() {
				public boolean accept(File subFile) {
					String fileName = subFile.getAbsolutePath();
					// 處理pom文件
					if(subFile.getName().contains(replaceFileName)){
						try {
							processReplaceFile(fileName);
						} catch (Exception e) {}
						return true;
					}
					return false;
				}
			});
		}
	}
	
	/**
	 * 文件讀入內存後替換字符串prevVersion -> curVersion
	 * @param filePath
	 * @throws Exception
	 */
	private void processReplaceFile(String filePath) throws Exception{
		File file = new File(filePath);
		StringBuilder sbd = new StringBuilder();
		FileReader fileReader = new FileReader(file);
		BufferedReader br = new BufferedReader(fileReader);
		String line;
		while ((line = br.readLine()) != null) {
			sbd.append(line + "\n");
        }
		String rawText = sbd.substring(0, sbd.length()-1);
		String newText = rawText.replace(prevVersion, curVersion);
		outputText(newText, file);
	}
	
	
	/**
	 * 從內存將修改過的文件回寫到磁盤
	 * @param text
	 * @param file
	 * @throws IOException
	 * @throws ClassNotFoundException
	 */
	private void outputText(String text, File file) 
			throws IOException, ClassNotFoundException{  
	    FileChannel fc = new RandomAccessFile(file.getAbsoluteFile(), "rw")  
	                          .getChannel();  
	    // 清空文件
	    fc.truncate(0);
	    // 從內存寫回文件
	    byte[] outputBytes = text.getBytes("UTF-8");  
	    long bytesNum = outputBytes.length;  
	    ByteBuffer bb = fc.map(FileChannel.MapMode.READ_WRITE, 0, bytesNum);  
	    bb.put(outputBytes);
	    fc.close();  
	}  
	
}