httpClient4发送gzip的post数据，servlet接收并解压

àì夳堔傛蜴生んèń 2021-09-14 09:40 328阅读 0赞

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：

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

参考：http://blog.csdn.net/lcx46/article/details/29393307