java 操作rar文件 java rar 解压

Java junrar只能解压rar5.0一下的rar压缩文件，解压rar5.0以上文件需要调用UnRAR.exe程序进行解压。

import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
 * 解压rar压缩文件
 * @author Administrator
 *
 */
public class UnRar {
	//获取项目路径
	private static String property = System.getProperty("user.dir");
	/**
     * rar解压
     * @param targetPath    解压文件路径
     * @param absolutePath  解压后存放的目录
     */
    public static String unRarFile(String uncompressFile, String targetPath) {
        try {
        	long start = System.currentTimeMillis();
            // 项目下UnRAR解压程序的路径
            String cmd = property+"/unrar/UnRAR.exe";
            //cmd命令
            String unrarCmd = cmd + " x -r -p- -o+ " + uncompressFile + " "
                    + targetPath;
            Runtime rt = Runtime.getRuntime();
            //调用程序UnRAR解压程序(Windows)
            Process pre = rt.exec(unrarCmd);
            //防止文件乱码
            InputStreamReader isr = new InputStreamReader(pre.getInputStream(),"GBK");
            BufferedReader bf = new BufferedReader(isr);
            String line = null;
            while ((line = bf.readLine()) != null) {
                line = line.trim();
                if ("".equals(line)) {
                    continue;
                }
                System.out.println(line);
            }
  
            bf.close();
            pre.destroy();
            long end = System.currentTimeMillis();
        	System.out.println("解压完毕，消时:"+(end-start)*0.001+"秒");
        } catch (Exception e) {
            System.out.println("解压发生异常");
        }
		return targetPath+"/";
}
 
}