java仿form表单提交数据

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class TestUploadPhoto {
public int send(String url, String filePath) throws IOException {
File file = new File(filePath);
if (!file.exists() || !file.isFile()) {
return -1;
}
/**
* 
* 第一部分
*/
URL urlObj = new URL(url);
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
OutputStream out = new DataOutputStream(con.getOutputStream());
//拼接数据
StringBuilder sb1 = new StringBuilder();
sb1.append("--"); // 必须多两道线
sb1.append(BOUNDARY);
sb1.append("\r\n");
sb1.append("--").append(BOUNDARY).append("\r\n").append("Content-Disposition: form-data; name=\"userid\";")
.append("\r\n\r\n12").append("\r\n");
//.append("\r\n\r\n12").append("/r/n").append("--").append(BOUNDARY).append("/r/n");  

byte[] head1 = sb1.toString().getBytes("utf-8");
out.write(head1);
//out.write(("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8"));
//拼接数据结束
// 第一部分：
StringBuilder sb = new StringBuilder();
//sb.append("--").append(BOUNDARY).append("\r\n").append("Content-Disposition: form-data; name=\"").append("userid").append("\"/r/n/r/n").append(  
         //"12").append("/r/n");  
sb.append("--"); // 必须多两道线
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition: form-data;name=\"pic\";filename=\""+ file.getName() + "\"\r\n").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());
out.write(head);
// 文件正文部分
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();
/**
* 
* 读取服务器响应，必须读取,否则提交不成功
*/
//return con.getResponseCode();
return con.getResponseCode();
/**
* 
* 下面的方式读取也是可以的
*/
// try {
// // 定义BufferedReader输入流来读取URL的响应
// BufferedReader reader = new BufferedReader(new InputStreamReader(
// con.getInputStream()));
// String line = null;
// while ((line = reader.readLine()) != null) {
// System.out.println(line);
// }
// } catch (Exception e) {
// System.out.println("发送POST请求出现异常！" + e);
// e.printStackTrace();
// }
}
public static void main(String[] args) throws IOException {
TestUploadPhoto up = new TestUploadPhoto();
System.out.println(up.send("http://192.168.1.100:8080/5aiyointerface/photo/uploadphoto.do","D:\\guide04.jpg"));   
     }

}