java模拟表单上传文件

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.ArrayList;
import java.util.List;

/**
 * 文件上传工具
 * @author cc
 *
 */
public class UploadTools {

		/**
		 * 上传本地文件
		 * @param listPath
		 * @param urlPath
		 * @return
		 */
		 public static String upload(List<String> listPath,String urlPath){
			//返回数据
			StringBuffer msg = new StringBuffer();
			try {
				String BOUNDARY = "---------7d4a6d158c9"; // 定义数据分隔线
				URL url = new URL(urlPath);
				HttpURLConnection conn = (HttpURLConnection) url.openConnection();
				// 发送POST请求必须设置如下两行
				conn.setDoOutput(true);
				conn.setDoInput(true);
				conn.setUseCaches(false);
				conn.setRequestMethod("POST");
				conn.setRequestProperty("connection", "Keep-Alive");
				conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
				conn.setRequestProperty("Charsert", "UTF-8");
				conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
				OutputStream out = new DataOutputStream(conn.getOutputStream());
				byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();// 定义最后数据分隔线
				int leng = listPath.size();
				for(int i=0;i<leng;i++){
					String fname = listPath.get(i);
					File file = new File(fname);
					StringBuilder sb = new StringBuilder();
					sb.append("--");
					sb.append(BOUNDARY);
					sb.append("\r\n");
					sb.append("Content-Disposition: form-data;name=\"file"+i+"\";filename=\""+ file.getName() + "\"\r\n");
					sb.append("Content-Type:application/octet-stream\r\n\r\n");
					byte[] data = sb.toString().getBytes();
					out.write(data);
					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);
					}
					out.write("\r\n".getBytes()); //多个文件时，二个文件之间加入这个
					in.close();
				}
				out.write(end_data);
				out.flush();
				out.close();
				// 定义BufferedReader输入流来读取URL的响应
				BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
				String line = null;
				while ((line = reader.readLine()) != null) {
					msg.append(line);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			return msg.toString();
		}
	 
		 /**
		 * 上传网络文件
		 * @param listPath
		 * @param urlPath
		 * @return
		 */
		 public static String upload(String fileName,String urlPath,byte[] bytesFile){
			//返回数据
			StringBuffer msg = new StringBuffer();
			try {
				String BOUNDARY = "---------7d4a6d158c9"; // 定义数据分隔线
				URL url = new URL(urlPath);
				HttpURLConnection conn = (HttpURLConnection) url.openConnection();
				// 发送POST请求必须设置如下两行
				conn.setDoOutput(true);
				conn.setDoInput(true);
				conn.setUseCaches(false);
				conn.setRequestMethod("POST");
				conn.setRequestProperty("connection", "Keep-Alive");
				conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
				conn.setRequestProperty("Charsert", "UTF-8");
				conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
				OutputStream out = new DataOutputStream(conn.getOutputStream());
				byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();// 定义最后数据分隔线
				// 数据流部分  //
				StringBuilder sb = new StringBuilder();
				sb.append("--");
				sb.append(BOUNDARY);
				sb.append("\r\n");
				sb.append("Content-Disposition: form-data;name=\"file\";filename=\""+ fileName + "\"\r\n");
				sb.append("Content-Type:application/octet-stream\r\n\r\n");
				byte[] data = sb.toString().getBytes();
				out.write(data);
				//写入文件
				out.write(bytesFile, 0, bytesFile.length);
				out.write("\r\n".getBytes()); //多个文件时，二个文件之间加入这个
				// 数据流部分  //
				out.write(end_data);
				out.flush();
				out.close();
				// 定义BufferedReader输入流来读取URL的响应
				BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
				String line = null;
				while ((line = reader.readLine()) != null) {
					msg.append(line);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			return msg.toString();
		}
	 
	 public static void main(String[] args){
		 List<String> list = new ArrayList<String>();
		 list.add("C:\\Hydrangeas.jpg");
	         UploadTools.upload(list,"http://127.0.0.1/upload/uploadData.do");
	 }
}