Example code sharing for using GZIP compression and decompression class in java

This article mainly introduces relevant information about the usage examples of GZIP compression and decompression class in java. Friends who need it can refer to

Usage examples of GZIP compression and decompression class in java

When our client and server transmit data, we need to use traffic. In order to save traffic, we often need to write a compression class to compress the data.

Example code:

import java.io.ByteArrayInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.IOException; 
import java.util.zip.GZIPInputStream; 
import java.util.zip.GZIPOutputStream; 
 
/** 
 * GZIP压缩解压类 
 */ 
public class MessageGZIP { 
   
  private static String encode = "utf-8";//"ISO-8859-1" 
   
  public String getEncode() { 
    return encode; 
  } 
 
  /* 
   * 设置 编码，默认编码：UTF-8 
   */ 
  public void setEncode(String encode) { 
    MessageGZIP.encode = encode; 
  } 
 
  /* 
   * 字符串压缩为字节数组 
   */ 
  public static byte[] compressToByte(String str){ 
    if (str == null || str.length() == 0) { 
      return null; 
    } 
    ByteArrayOutputStream out = new ByteArrayOutputStream(); 
    GZIPOutputStream gzip; 
    try { 
      gzip = new GZIPOutputStream(out); 
      gzip.write(str.getBytes(encode)); 
      gzip.close(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return out.toByteArray(); 
  } 
 
  /* 
   * 字符串压缩为字节数组 
   */ 
  public static byte[] compressToByte(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 (IOException e) { 
      e.printStackTrace(); 
    } 
    return out.toByteArray(); 
  } 
 
  /* 
   * 字节数组解压缩后返回字符串 
   */ 
  public static String uncompressToString(byte[] b) { 
    if (b == null || b.length == 0) { 
      return null; 
    } 
    ByteArrayOutputStream out = new ByteArrayOutputStream(); 
    ByteArrayInputStream in = new ByteArrayInputStream(b); 
 
    try { 
      GZIPInputStream gunzip = new GZIPInputStream(in); 
      byte[] buffer = new byte[256]; 
      int n; 
      while ((n = gunzip.read(buffer)) >= 0) { 
        out.write(buffer, 0, n); 
      } 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return out.toString(); 
  } 
 
  /* 
   * 字节数组解压缩后返回字符串 
   */ 
  public static String uncompressToString(byte[] b, String encoding) { 
    if (b == null || b.length == 0) { 
      return null; 
    } 
    ByteArrayOutputStream out = new ByteArrayOutputStream(); 
    ByteArrayInputStream in = new ByteArrayInputStream(b); 
 
    try { 
      GZIPInputStream gunzip = new GZIPInputStream(in); 
      byte[] buffer = new byte[256]; 
      int n; 
      while ((n = gunzip.read(buffer)) >= 0) { 
        out.write(buffer, 0, n); 
      } 
      return out.toString(encoding); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return null; 
  } 
}

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