Java 后台模拟POST上传

后台模拟POST上传整合

简介：Java后台模拟post请求,发送参数以及上传文件等方式,适用有些公众API接口的调用.

发送请求

后台

package org.lives.platform.upload.utils;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.activation.MimetypesFileTypeMap;

import org.junit.Test;
import org.liufeng.weixin.pojo.AccessToken;
import org.liufeng.weixin.util.WeixinUtil;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class HttpPostUploadUtil {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		//要上传的文件地址
		String filepath = "F:\\2.png";

		String urlStr = "http://localhost:8080/wxchar_menu/upload";

		Map<String, String> textMap = new HashMap<String, String>();

		textMap.put("name", "testname");

		Map<String, String> fileMap = new HashMap<String, String>();
		
        //随便写入的参数
		fileMap.put("userfile", filepath);

		String ret = formUpload(urlStr, textMap, fileMap);

		System.out.println(ret);

	}

	/**
	 * 
	 * @param urlStr
	 * @param textMap
	 * @param fileMap
	 * @return
	 */
	public static String formUpload(String urlStr, Map<String, String> textMap,
			Map<String, String> fileMap) {
		String res = "";
		HttpURLConnection conn = null;
		String BOUNDARY = "---------------------------123821742118716"; // boundary就是request头和上传文件内容的分隔符
		try {
			URL url = new URL(urlStr);
			conn = (HttpURLConnection) url.openConnection();
			conn.setConnectTimeout(5000);
			conn.setReadTimeout(30000);
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setUseCaches(false);
			conn.setRequestMethod("POST");
			conn.setRequestProperty("Connection", "Keep-Alive");
			conn.setRequestProperty("User-Agent",
					"Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
			conn.setRequestProperty("Content-Type",
					"multipart/form-data; boundary=" + BOUNDARY);

			OutputStream out = new DataOutputStream(conn.getOutputStream());
			// text
			if (textMap != null) {
				StringBuffer strBuf = new StringBuffer();
				Iterator iter = textMap.entrySet().iterator();
				while (iter.hasNext()) {
					Map.Entry entry = (Map.Entry) iter.next();
					String inputName = (String) entry.getKey();
					String inputValue = (String) entry.getValue();
					if (inputValue == null) {
						continue;
					}
					strBuf.append("\r\n").append("--").append(BOUNDARY)
							.append("\r\n");
					strBuf.append("Content-Disposition: form-data; name=\""
							+ inputName + "\"\r\n\r\n");
					strBuf.append(inputValue);
				}
				out.write(strBuf.toString().getBytes());
			}

			// file
			if (fileMap != null) {
				Iterator iter = fileMap.entrySet().iterator();
				while (iter.hasNext()) {
					Map.Entry entry = (Map.Entry) iter.next();
					String inputName = (String) entry.getKey();
					String inputValue = (String) entry.getValue();
					if (inputValue == null) {
						continue;
					}
					File file = new File(inputValue);
					String filename = file.getName();
					String contentType = new MimetypesFileTypeMap()
							.getContentType(file);
					if (filename.endsWith(".png")) {
						contentType = "image/png";
					}
					if (contentType == null || contentType.equals("")) {
						contentType = "application/octet-stream";
					}

					StringBuffer strBuf = new StringBuffer();
					strBuf.append("\r\n").append("--").append(BOUNDARY)
							.append("\r\n");
					strBuf.append("Content-Disposition: form-data; name=\""
							+ inputName + "\"; filename=\"" + filename
							+ "\"\r\n");
					strBuf.append("Content-Type:" + contentType + "\r\n\r\n");

					out.write(strBuf.toString().getBytes());

					DataInputStream in = new DataInputStream(
							new FileInputStream(file));
					int bytes = 0;
					byte[] bufferOut = new byte[1024];
					while ((bytes = in.read(bufferOut)) != -1) {
						out.write(bufferOut, 0, bytes);
					}
					in.close();
				}
			}

			byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
			out.write(endData);
			out.flush();
			out.close();

			// 数据返回
			StringBuffer strBuf = new StringBuffer();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					conn.getInputStream()));
			String line = null;
			while ((line = reader.readLine()) != null) {
				strBuf.append(line).append("\n");
			}
			res = strBuf.toString();
			reader.close();
			reader = null;
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (conn != null) {
				conn.disconnect();
				conn = null;
			}
		}
		return res;
	}

}

这样的效果就相当于是页面上的：

 <form action="/wxchar_menu/upload" method="post"
		enctype="multipart/form-data">
		<label> <input type="text" name="name" value="name" />
		</label> <label> <input type="file" name="userfile" />
		</label> <label> <input type="submit" value="up" />
		</label>
	</form>

后台接受

package org.lives.platform.upload.utils;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class ManageServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String title = request.getParameter("title");
		String timelength = request.getParameter("timelength");
		System.out.println("视频名称：" + title);
		System.out.println("时长：" + timelength);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		if (isMultipart) {
			try {
				FileItemFactory factory = new DiskFileItemFactory();
				//                 File filetemp = new File("d:/a");
				//                 if(!filetemp.exists()){filetemp.mkdirs();}
				//                 factory.setRepository(new File("d:/a"));
				// //设置临时目录
				//                 factory.setSizeThreshold(1024*8);
				// //8k的缓冲区,文件大于8K则保存到临时目录
				ServletFileUpload upload = new ServletFileUpload(factory);
				upload.setHeaderEncoding("UTF-8");
				//                 upload.setFileSizeMax(1024 * 1024 * 10*2);//
				// 设置每个文件最大为20M
				//                 upload.setSizeMax(1024 * 1024 * 100);//
				// 一共最多能上传100M
				List<FileItem> items = upload.parseRequest(request);
				String dir = request.getSession().getServletContext()
						.getRealPath("/files");
				// File dirFile = new File(dir);
				//存在了本地e盘下面
				File dirFile = new File("e://downFiles");
				if (!dirFile.exists())
					dirFile.mkdirs();
				for (FileItem item : items) {
					if (item.isFormField()) {// 如果文本类型参数
						String name = item.getFieldName();
						String value = item.getString("UTF-8");
						System.out.println(name + "=" + value);
					} else {// 如果文件类型参数
						System.out.println(dir);
						File saveFile = new File(dirFile, item.getName());
						item.write(saveFile);
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		} else {
			doGet(request, response);
		}
	}

}

需要的jar

http://download.youkuaiyun.com/detail/u014201191/8829429