實用工具--簡單用例文件壓縮

1.導包

maven方式

<dependency>
<groupId>org.apache.ant</groupId>
<artifactId>ant</artifactId>
<version>1.9.4</version></dependency>

2.示例代碼

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;


public class FileCompress {
    static final int BUFFER = 8192;   
    //初始化    
    private File zipFile;   
  
    public FileCompress(String pathName) {   
        zipFile = new File(pathName);   
    } 
    
     /**
	* 壓縮文件
	* @param srcPathName
	*/
     public void compress(String srcPathName) {
	 File file = new File(srcPathName);
		 if (!file.exists()){
			 throw new RuntimeException(srcPathName + "不存在！");
		 }
		 try {
			 FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
			 CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
					 new CRC32());  //不加CRC32，一樣可以生成文件。關於數據如何校驗，請高手指點
			 ZipOutputStream out = new ZipOutputStream(cos);
			 out.setEncoding("gbk");  //如果不加此句，壓縮文件依然可以生成，只是在打開和解壓的時候，會顯示亂碼，但是還是會解壓出來
			 String basedir = "";
			 compress(file, out, basedir);
			 out.close();
		 } catch (Exception e) {
			 throw new RuntimeException(e);
		 }
	 }
	 
	/**
	 * 壓縮一個目錄  
	 * @param dir
	 * @param out
	 * @param basedir
	 */
    private void compressDirectory(File dir, ZipOutputStream out, String basedir) {   
        if (!dir.exists())return;   
        File[] files = dir.listFiles();   
        for (int i = 0; i < files.length; i++) {
            /* 遞歸 */  
            compress(files[i], out, basedir + dir.getName() + "/");
        }   
	 }

	 private void compress(File file, ZipOutputStream out, String basedir) {   
        /* 判斷是目錄還是文件 */  
        if (file.isDirectory()) {   
            this.compressDirectory(file, out, basedir);   
        } else {   
            this.compressFile(file, out, basedir);   
        }   
	 }   
	 
	 /**
	  * 壓縮一個文件
	  * @param file
	  * @param out
	  * @param basedir
	  */
	 private void compressFile(File file, ZipOutputStream out, String basedir) {
		  if (!file.exists()) {
			  return;
		  }
		  try {
			   BufferedInputStream bis = new BufferedInputStream(
			     new FileInputStream(file));
			   ZipEntry entry = new ZipEntry(basedir + file.getName());
			   out.putNextEntry(entry);
			   int count;
			   byte data[] = new byte[BUFFER];
			   while ((count = bis.read(data, 0, BUFFER)) != -1) {
			    out.write(data, 0, count);
			   }
			   bis.close();
		  } catch (Exception e) {
			  throw new RuntimeException(e);
		  }
	 }
	 
	 //事例
	 public static void main(String[] args) {
		    FileCompress zc = new FileCompress("H://中文.zip");
		    zc.compress("H://test中文");  //壓縮一個文件夾
		    System.out.println("123");
	}
}