使用HttpClient携带文件发送请求简单实例

所需jar包： commons-codec-1.6.jarcommons-io-1.2.jarcommons-logging-1.1.3.jarfluent-hc-4.3.3.jarhttpclient-4.3.3.jarhttpclient-cache-4.3.3.jarhttpcore-4.3.2.jarhttpmime-4.3.3.jar点击下载jar包： httpcomponents-client-4.3.3-bin.tar.gz         官网地址：http://hc.apache.org/httpclient-3.x/ HttpClient请求 

package com.servser;

import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;

import net.sf.json.JSONObject;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.FileEntity;
import org.apache.http.impl.client.DefaultHttpClient;

public class ClientTest {

public static void main(String[] args) throws Exception {

String filePath = "";
String servletPath = "";
//本地影像地址
filePath = "d:/img/000000000163887-2.jpg";
//连接服务端地址参数直接在地址后加上
servletPath = "http://192.168.1.226:8080/ServletDemo/ServletTest?test1=test";

File file = new File(filePath);
FileEntity fileEntity = new FileEntity(file, "text/plain;charset=gbk");
HttpPost httpPost = new HttpPost(servletPath);
httpPost.setHeader("Content-Type","text/xml;charset=gbk");
httpPost.setEntity(fileEntity); //set影像
System.out.println(httpPost);

HttpClient httpclient = new DefaultHttpClient();
//发送请求
HttpResponse response = httpclient.execute(httpPost);
HttpEntity entity = response.getEntity();

if (entity != null) {
//返参
InputStream instream = entity.getContent();
//转换为String
String str = IOUtils.toString(new InputStreamReader(instream));
//因为本实例发送的json格式需要进行解析
JSONObject obj = JSONObject.fromObject(str) ;
System.out.println(obj.get("imageKey"));
System.out.println(obj.get("flag"));
System.out.println(obj.get("detail"));
IOUtils.closeQuietly(instream);
//System.out.println(new String(str.getBytes("utf-8")));
}
}

}

解析Json格式所需JSON-lib jar包

	commons-beanutils-1.8.0.jarcommons-collections-3.2.jarcommons-lang-2.4.jarcommons-logging-1.0.4.jarezmorph-1.0.4.jarjson-lib-2.2.3-jdk15.jar 

服务端(使用的是servlet) 

package com.servlet;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.IOUtils;/*** Servlet implementation class ServletTest*/@WebServlet("/ServletTest")public class ServletTest extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public ServletTest() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request,HttpServletResponse response)*/protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request,response);}/*** @see HttpServlet#doPost(HttpServletRequest request,HttpServletResponse response)*/protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {response.setCharacterEncoding("utf-8"); //解决中文乱码问题System.out.println(request.getParameter("test1")); //接参String imageKey = "3313"; //设置反参String flag = "N";//设置反参String detail = "不清晰";//设置反参//这个是返回简单字符串方式,示例使用的是返回json格式//response.getWriter().print(detail);//把接收过来的影像转换为byte数组byte [] bfile = IOUtils.toByteArray(request.getInputStream());BufferedOutputStream bos = null;FileOutputStream fos = null;File file = null;try {// File dir = new File("d:/");/*if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在dir.mkdirs();}*/file = new File("d:/img.jpg");fos = new FileOutputStream(file);bos = new BufferedOutputStream(fos);bos.write(bfile);  //把接收到的影像保存到磁盘} catch (Exception e) {e.printStackTrace();} finally {if (bos != null) {try {bos.close();} catch (IOException e1) {e1.printStackTrace();}}if (fos != null) {try {fos.close();} catch (IOException e1) {e1.printStackTrace();}}}//返回参数,使用拼接json格式response.getWriter().print("{\"imageKey\":\""+imageKey+"\",\"flag\":\""+flag+"\",\"detail\":\""+detail+"\"}");}}