页面Gzip压缩与解压缩工具类GZIPUtils

问题：

F12能看到Response Headers的信息，一般情况下，Content-Encoding为gzip时就表明该文件是一个压缩过的。

需求：

需要过滤该页面，并且对内容进行修改，但是是一个压缩格式的修改不了！

解决方案：

对response的gzip格式进行解压。

直接上GZIPUtils的代码，网上找的，呵呵
 

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZIPUtils  {
    public static final String GZIP_ENCODE_UTF_8 = "UTF-8"; 
    public static final String GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1";

    
    public static byte[] compress(String str, String encoding) {
        if (str == null || str.length() == 0) {
            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip;
        try {
            gzip = new GZIPOutputStream(out);
            gzip.write(str.getBytes(encoding));
            gzip.close();
        } catch ( Exception e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }
    
    public static byte[] compress(String str) throws IOException {  
        return compress(str, GZIP_ENCODE_UTF_8);  
    }
    
    public static byte[] uncompress(byte[] bytes) {
        if (bytes == null || bytes.length == 0) {
            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        try {
            GZIPInputStream ungzip = new GZIPInputStream(in);
            byte[] buffer = new byte[256];
            int n;
            while ((n = ungzip.read(buffer)) >= 0) {
                out.write(buffer, 0, n);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }
    
    public static String uncompressToString(byte[] bytes, String encoding) {  
        if (bytes == null || bytes.length == 0) {  
            return null;  
        }  
        ByteArrayOutputStream out = new ByteArrayOutputStream();  
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);  
        try {
            GZIPInputStream ungzip = new GZIPInputStream(in);  
            byte[] buffer = new byte[256];  
            int n;  
            while ((n = ungzip.read(buffer)) >= 0) {  
                out.write(buffer, 0, n);  
            }  
            return out.toString(encoding);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    public static String uncompressToString(byte[] bytes) {  
        return uncompressToString(bytes, GZIP_ENCODE_UTF_8);  
    } 
    
//    public static void main(String[] args) throws IOException {
//        String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
//        System.out.println("字符串长度："+s.length());
//        System.out.println("压缩后：："+compress(s).length);
//        System.out.println("解压后："+uncompress(compress(s)).length);
//        System.out.println("解压字符串后：："+uncompressToString(compress(s)).length());
//    }
}

使用方式：

            System.out.println("Encoding  is:"+response.getHeader("Content-Encoding"));
			//判断返回的内容的Content-Encoding是否是gzip
			if(response.getHeader("Content-Encoding")=="gzip") {
				//System.out.println("解压中。。。。。。");
				byte[] uncompress = GZIPUtils.uncompress(buffer);
				System.out.println("解压后内容："+new String(uncompress));
				//
				    // 内容修改操作
				//
            }

后续自行研究了