由於項目需求，需要在C#中壓縮，然後在java裡解壓縮，或者倒過來，在Java裡壓縮，C#裡解壓縮，以下代碼經測試驗證通過。
關鍵技術點和體會:
壓縮的結果采用Base64編碼，方便在Java端或者C#端打印出來調試，也方便在不同的應用間傳輸（如webservice），缺點是比轉碼前體積變大了約35%
字符串采用UTF-8編碼獲得byte數組，保證兩端通用，如果應用對編碼有要求，兩端同時改為其他編碼方式也可以
從Java和C#的代碼看，兩者代碼上有細微差別，但是思路方面兩者基本是一樣的
另外一個備忘，Java裡邊，Stream類要及時close，不然輸出的結果是不完整的，即使調用了flush
C#的using真好用，Java的類似語言特性在1.7才支持...
Java，用Session Bean建立了一個簡單的WebService，提供一個簡單的調用SayHello，然後C#裡建立一個winform應用，添加服務引用，引用Java的webservice WSDL。
具體過程不多說，代碼如下：
Java代碼：
[javascript]
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebService;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
@Stateless
@WebService
public class TestWebService {
@WebMethod
public String SayHello(String name) throws Exception {
String t = uncompress(name);
return compress("解壓：" + t);
}
@WebMethod(exclude = true)
public static String compress(String str) throws IOException {
if (str == null || str.length() == 0) {
return "";
}
byte[] tArray;
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
try {
gzip.write(str.getBytes("UTF-8"));
gzip.flush();
} finally {
gzip.close();
}
tArray = out.toByteArray();
out.close();
BASE64Encoder tBase64Encoder = new BASE64Encoder();
return tBase64Encoder.encode(tArray);
}
@WebMethod(exclude = true)
public static String uncompress(String str) throws IOException {
if (str == null || str.length() == 0) {
return "";
}
BASE64Decoder tBase64Decoder = new BASE64Decoder();
byte[] t = tBase64Decoder.decodeBuffer(str);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(t);
GZIPInputStream gunzip = new GZIPInputStream(in);
try {
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer)) >= 0) {
out.write(buffer, 0, n);
}
}finally{
gunzip.close();
}
in.close();
out.close();
return out.toString("UTF-8");
}
}
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebService;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
@Stateless
@WebService
public class TestWebService {
@WebMethod
public String SayHello(String name) throws Exception {
String t = uncompress(name);
return compress("解壓：" + t);
}
@WebMethod(exclude = true)
public static String compress(String str) throws IOException {
if (str == null || str.length() == 0) {
return "";
}
byte[] tArray;
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
try {
gzip.write(str.getBytes("UTF-8"));
gzip.flush();
} finally {
gzip.close();
}
tArray = out.toByteArray();
out.close();
BASE64Encoder tBase64Encoder = new BASE64Encoder();
return tBase64Encoder.encode(tArray);
}
@WebMethod(exclude = true)
public static String uncompress(String str) throws IOException {
if (str == null || str.length() == 0) {
return "";
}
BASE64Decoder tBase64Decoder = new BASE64Decoder();
byte[] t = tBase64Decoder.decodeBuffer(str);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(t);
GZIPInputStream gunzip = new GZIPInputStream(in);
try {
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer)) >= 0) {
out.write(buffer, 0, n);
}
}finally{
gunzip.close();
}
in.close();
out.close();
return out.toString("UTF-8");
}
}
C#的代碼：
[csharp]
using System;
using System.IO;
using System.IO.Compression;
using System.Text;
using System.Windows.Forms;
using testWebService.ServiceReference1;
namespace testWebService
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnSayOK_Click(object sender, EventArgs e)
{
string name = txtName.Text;
string zipedName = Zip(name);
TestWebServiceClient client = new TestWebServiceClient();
string result = client.SayHello(zipedName);
MessageBox.Show(UnZip(result));
}
public static string Zip(string value)
{
byte[] byteArray = Encoding.UTF8.GetBytes(value);
byte[] tmpArray;
using (MemoryStream ms = new MemoryStream())
{
using (GZipStream sw = new GZipStream(ms, CompressionMode.Compress))
{
sw.Write(byteArray, 0, byteArray.Length);
sw.Flush();
}
tmpArray = ms.ToArray();
}
return Convert.ToBase64String(tmpArray);
}
public static string UnZip(string value)
{
byte[] byteArray = Convert.FromBase64String(value);
byte[] tmpArray;
using (MemoryStream msOut = new MemoryStream())
{
using (MemoryStream msIn = new MemoryStream(byteArray))
{
using (GZipStream swZip = new GZipStream(msIn, CompressionMode.Decompress))
{
swZip.CopyTo(msOut);
tmpArray = msOut.ToArray();
}
}
}
return Encoding.UTF8.GetString(tmpArray);
}
}
}
