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 = ":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());// textif (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());}// fileif (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
漫过心际的孤独，早已蔚然成冰，而你是这个季节里最美的音符。
