httpClient4发送gzip的post数据，servlet接收并解压 _HttpClient

仰天大笑出门去，我辈岂是蓬蒿人。这篇文章主要讲述httpClient4发送gzip的post数据，servlet接收并解压相关的知识，希望能为你提供帮助。
1、gzipUtils工具类：

package nc.edu.nuc.utils;

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 String compress(String str) throws IOException
if (str == null || str.length() == 0)
return str;

ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes());
gzip.close();
return out.toString("ISO-8859-1"); // UTF-8 ISO-8859-1

// 解压缩
public static String uncompress(String str) throws IOException
if (str == null || str.length() == 0)
return str;

ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(
str.getBytes("ISO-8859-1"));
GZIPInputStream gunzip = new GZIPInputStream(in);
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer)) > = 0)
out.write(buffer, 0, n);

// toString()使用平台默认编码，也可以显式的指定如toString("GBK")
return out.toString();

2、客户端：
【httpClient4发送gzip的post数据，servlet接收并解压】pom.xml文件：

< dependency>
< groupId> org.apache.httpcomponents< /groupId>
< artifactId> httpcore< /artifactId>
< version> 4.4< /version>
< /dependency>
< dependency>
< groupId> org.apache.httpcomponents< /groupId>
< artifactId> httpclient< /artifactId>
< version> 4.5.1< /version>
< /dependency>
< dependency>
< groupId> org.apache.httpcomponents< /groupId>
< artifactId> httpasyncclient< /artifactId>
< version> 4.1.1< /version>
< /dependency>

代码：

public static void main(String[] args) throws IOException

String str = "msg=[p1:\\"12_22_235\\",pu:\\"1\\",v:\\"1.0.1\\",net_work:\\" \\",ua_model:\\" \\",os_v:\\"\\",t:\\"1\\",rpage:\\"1\\",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2,"
+ "p1:\\"2_22_235\\",pu:\\"1\\",v:\\"1.0.1\\",net_work:\\" \\",ua_model:\\" \\",os_v:\\"\\",t:\\"1\\",rpage:\\"1\\",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2,"
+ "p1:\\"2_22_235\\",pu:\\"1\\",v:\\"1.0.1\\",net_work:\\" \\",ua_model:\\" \\",os_v:\\"\\",t:\\"1\\",rpage:\\"1\\",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2]";

HttpClient httpClient = new DefaultHttpClient();
HttpPost method = new HttpPost("http://localhost:8080/WebTest/ReciveAndUnzipServlet?a=test1");
method.addHeader("Content-type","application/json; charset=ISO-8859-1");
method.setHeader("Accept", "application/json");
method.setHeader("Content-Encoding", "gzip");
method.setEntity(new StringEntity(GzipUtils.compress(str), Charset.forName("ISO-8859-1")));

HttpResponse response = httpClient.execute(method);

int statusCode = response.getStatusLine().getStatusCode();

if (statusCode != HttpStatus.SC_OK)
System.out.println("error...");

// Read the response body
String body = EntityUtils.toString(response.getEntity());

System.out.println(body);

对key=value使用gzip进行压缩，同时设置header的Content-Encoding，发送post请求。

3、服务端：

/**
* 接受httpClient发过来的gzip压缩数据，解压，然后使用。
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
String parameter = request.getParameter("a");
System.out.println(parameter);

String acceptjson = "";
String contentEncoding = request.getHeader("Content-Encoding");
if (null != contentEncoding & & contentEncoding.indexOf("gzip") != -1)
ServletInputStream inputStream = request.getInputStream();
if (inputStream !=null)
GZIPInputStream gzis = new GZIPInputStream(inputStream);
InputStreamReader reader = new InputStreamReader(gzis);
BufferedReader br = new BufferedReader(reader);

StringBuffer sb = new StringBuffer("");
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);

br.close();
acceptjson = sb.toString();

else
acceptjson = "no compress...";

PrintWriter out = response.getWriter();
out.println(acceptjson);
out.close();

1）打印url传来的参数；

2）通过http的header中Content-Encoding判断是否压缩数据；
3）把压缩的数据解压，然后原封不动key=value的格式返回给客户端。
运行服务端，然后运行客户端，最后客户端返回：

msg=[p1:"12_22_235",pu:"1",v:"1.0.1",net_work:" ",ua_model:" ",os_v:"",t:"1",rpage:"1",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2,p1:"2_22_235",pu:"1",v:"1.0.1",net_work:" ",ua_model:" ",os_v:"",t:"1",rpage:"1",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2,p1:"2_22_235",pu:"1",v:"1.0.1",net_work:" ",ua_model:" ",os_v:"",t:"1",rpage:"1",tm_1:2,tm_2:2,tm_3:2,tm_4:2,tm_5:2,rload:2]

4）直接通过浏览器请求：http://localhost:8080/WebTest/ReciveAndUnzipServlet?a=test
在浏览器上显示：

no compress...

补充：
1）nginx中配置的gzip on，是指户请求的内容再发送到用户客户端之前，Nginx服务器会根据一些具体的策略实施压缩。
2）通常在server端需要解压gzip数据的时候，一般都是通过过滤器来完成，可以参考下面的链接