java上传文件到微信客户端

package utils.weixin;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

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

public class FileUpload {

 /**
 * 模拟form表单的形式 ，上传文件 以输出流的形式把文件写入到url中，然后用输入流来获取url的响应
 * 
 * @param url
 *            请求地址 form表单url地址
 * @param filePath
 *            文件在服务器保存路径
 * @return String url的响应信息返回值
 * @throws IOException
 */
 public static String send(String url, String filePath) throws IOException {

 String result = null;

 File file = new File(filePath);
 if (!file.exists() || !file.isFile()) {
 throw new IOException("文件不存在");
 }

 /**
 * 第一部分
 */
 URL urlObj = new URL(url);
 // 连接
 HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();

 /**
 * 设置关键值
 */
 con.setRequestMethod("POST"); // 以Post方式提交表单，默认get方式
 con.setDoInput(true);
 con.setDoOutput(true);
 con.setUseCaches(false); // post方式不能使用缓存

 // 设置请求头信息
 con.setRequestProperty("Connection", "Keep-Alive");
 con.setRequestProperty("Charset", "UTF-8");

 // 设置边界
 String BOUNDARY = "----------" + System.currentTimeMillis();
 con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);

 // 请求正文信息

 // 第一部分：
 StringBuilder sb = new StringBuilder();
 sb.append("--"); // 必须多两道线
 sb.append(BOUNDARY);
 sb.append("\r\n");
 sb.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"\r\n");
 sb.append("Content-Type:application/octet-stream\r\n\r\n");

 byte[] head = sb.toString().getBytes("utf-8");

 // 获得输出流
 OutputStream out = new DataOutputStream(con.getOutputStream());
 // 输出表头
 out.write(head);

 // 文件正文部分
 // 把文件已流文件的方式 推入到url中
 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();

 // 结尾部分
 byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线

 out.write(foot);

 out.flush();
 out.close();

 StringBuffer buffer = new StringBuffer();
 BufferedReader reader = null;
 try {
 // 定义BufferedReader输入流来读取URL的响应
 reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
 String line = null;
 while ((line = reader.readLine()) != null) {
 // System.out.println(line);
 buffer.append(line);
 }
 if (result == null) {
 result = buffer.toString();
 }
 System.out.println(result);
 } catch (IOException e) {
 System.out.println("发送POST请求出现异常！" + e);
 e.printStackTrace();
 throw new IOException("数据读取异常");
 } finally {
 if (reader != null) {
 reader.close();
 }

 }

 JSONObject jsonObj = JSONObject.fromObject(result);
 String mediaId = jsonObj.getString("media_id");
 return mediaId;
 }

 public static void main(String[] args) throws IOException {
 String filePath = "F:/xjy/pic/noviaLogo.gif";
 String sendUrl = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token=yeQEu_OrXQanGC_G56BZ7IKJDCQCaO0ryDWKX2N2JDzGRGuiZACTGjsQXW-S-K1fgm_MViG_R5AwIEBhKKCNmUevg0H3ksfzlIfkFcP1y8g2st2LYwloL_iPqhedlT5_Z1zSM2mZSmu6cI54sayMPw&type=image";
 String result = null;
 FileUpload fileUpload = new FileUpload();
 result = fileUpload.send(sendUrl, filePath);
 System.out.println(result);

 }
}

引用自[u] http://1147295574-qq-com.iteye.com/blog/2005540[/u]