请问，jpg文件压缩成zip后，再用winrar解压后为什么不能正常显示图片

// 在此输入java代码
public class ZipEncoding {

	private String[] fileNames; //需压缩文件名集合
	
	private String bundleUrl; //zip文件的所在文件包的路径
	
	private String zipName; //zip的文件名
	
	/**
	 * 
	 * @param fileNames 文件名集合 以 ***.**格式
	 * @param zipName   zip文件的文件名  
	 * @param bundleUrl  ./?????/
	 */
	public ZipEncoding(String[] fileNames,String zipName,
			String bundleUrl){
		this.fileNames = fileNames;
		this.zipName = zipName + ".zip";
		this.bundleUrl = bundleUrl;
	}
	
	public boolean zip() throws IOException{
		boolean ok = false;
		FileOutputStream f = new FileOutputStream(bundleUrl + zipName);
		CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
		ZipOutputStream out = 
			new ZipOutputStream(
					new BufferedOutputStream(csum));
		
		try{
			//TODO delete
			out.setComment(" A test of java zipping");
			
			for(int i = 0 ; i < fileNames.length ; i ++){
				if ( new File(bundleUrl + fileNames[i]).exists()){
					BufferedReader in =
						new BufferedReader(
								new FileReader(bundleUrl + fileNames[i]));
		
					out.putNextEntry(new ZipEntry(bundleUrl + fileNames[i]));
					int c ;
					while (( c = in.read()) != -1){
						out.write(c);
					}
					in.close();
				}else
					continue;
			}
			ok = true;
		}catch(Exception e){
			throw new IOException(
					"ZipEncoding.zip() error \n" + e.getMessage());
		}finally{
			out.close();
		}
		return ok;
	}
	
	public boolean unzip() throws IOException{
		boolean ok = false;
		return ok;
	}
	
	public static void main(String[] args){
		try{
			//String fileNames[] = {"513306020013.jpg","513306020014.jpg","513306020015.jpg"};
			String fileNames[] = {"text1.txt","text2.txt","text3.txt"};
			String zipName = "meinv";
			String bundleUrl = "E:/";
			ZipEncoding zip = new ZipEncoding(fileNames,zipName,bundleUrl);
			boolean ok = zip.zip();
			System.out.println("=======zip ok=======" + ok);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}
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