android http文件上传工具类

/**
 * util
 */
package com.example.testtcp;


import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;


/**
 * （以HTTP方式上传） 文件上传工具类
 * 
 * @author JiaRH
 * 
 * @date 2013-11-30 下午2:33:44
 */
public class Upload_files_util {
/**
* 
* @param actionUrl
*            上传地址
* @param FileName
*            上传文件路径
* @return
* @throws IOException
*/


public static String upload(String actionUrl, String FileName)
throws IOException {
// 产生随机分隔内容
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
// 定义URL实例
URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
// 设置从主机读取数据超时
conn.setReadTimeout(10 * 1000);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
// 维持长连接
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charset", "UTF-8");
// 设置文件类型
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA
+ ";boundary=" + BOUNDARY);
// 创建一个新的数据输出流，将数据写入指定基础输出流
DataOutputStream outStream = new DataOutputStream(
conn.getOutputStream());
// 发送文件数据
if (FileName != null) {
// 构建发送字符串数据
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\""
+ FileName + "\"" + LINEND);
sb1.append("Content-Type: application/octet-stream;chartset="
+ CHARSET + LINEND);
sb1.append(LINEND);
// 写入到输出流中
outStream.write(sb1.toString().getBytes());
// 将文件读入输入流中
InputStream is = new FileInputStream(FileName);
byte[] buffer = new byte[1024];
int len = 0;
// 写入输出流
while ((len = is.read(buffer)) != -1) {


outStream.write(buffer, 0, len);
}
is.close();
// 添加换行标志
outStream.write(LINEND.getBytes());
}
// 请求结束标志
byte[] end_data = (PREFFIX + BOUNDARY + PREFFIX + LINEND).getBytes();
outStream.write(end_data);
// 刷新发送数据
outStream.flush();
// 得到响应码
int res = conn.getResponseCode();


InputStream in = null;
// 上传成功返回200
if (res == 200) {
in = conn.getInputStream();
int ch;
StringBuilder sb2 = new StringBuilder();
// 保存数据
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
// 如果数据不为空，则以字符串方式返回数据，否则返回null
return in == null ? null : in.toString();
};

}

原文地址：http://blog.csdn.net/jiaruihua_blog/article/details/17040819