java 一字段上传多个文件（可带文字参数）

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;


/**
 * 上传文件到服务器类

 */
public class UploadFramkwork
{
public interface UploadCallback
{
public void onFinished(String result);
}

private static final int TIME_OUT = 60 * 1000; // 超时时间
private static final String CHARSET = "utf-8"; // 设置编码
private static UploadFramkwork  instance = null;


private UploadFramkwork(){}


public static UploadFramkwork getInstance()
{
if(null == instance)
{
synchronized (UploadFramkwork.class)
{
if(null == instance)
instance = new UploadFramkwork();
}
}
return instance;
}

public static void main(String[] args)

{

//以下是试用方法

String url =  "http://192.168.1.240:8080/wisdom/pass.do?method=AnIn";
UploadFramkwork up = UploadFramkwork.getInstance();
File file1 = new File("C:\\Users\\Public\\Pictures\\Sample Pictures\\1.png");
File file2 = new File("C:\\Users\\Public\\Pictures\\Sample Pictures\\2.png");
Map<String, String> strParam = new HashMap<String, String>();
Map<String, File> fileParam = new HashMap<String, File>();
fileParam.put("file1", file1);
fileParam.put("file2", file2);
   up.postMutiFiles(url,strParam, fileParam, "file", new UploadCallback()
{

@Override
public void onFinished(String result)
{
System.out.println(result);
}
});
}





/**
* 
* 描述: 上传多个文件， 
* @param url 网络地址
* @param params  文字字段
* @param files  String 文件名,  File 文件
* @param file 文件字段
* @param  callback 响应回调
*/
public   void  postMutiFiles(String url, Map<String, String> params,
Map<String, File> files, String fileName, UploadCallback callback)
{
String result = null;
String BOUNDARY = UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
try
{
URL uri = new URL(url);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setConnectTimeout(TIME_OUT);
conn.setReadTimeout(TIME_OUT); // 缓存的最长时间
conn.setDoInput(true);// 允许输入
conn.setDoOutput(true);// 允许输出
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA
+ ";boundary=" + BOUNDARY);
// 首先组拼文本类型的参数
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet())
{
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\""
+ entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET
+ LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}


DataOutputStream outStream = new DataOutputStream(
conn.getOutputStream());
outStream.write(sb.toString().getBytes());
// 拼接文件数据
if (files != null)
{
for (Map.Entry<String, File> file : files.entrySet())
{
StringBuilder sbFile = new StringBuilder();
sbFile.append(PREFIX);
sbFile.append(BOUNDARY);
sbFile.append(LINEND);
/**
* 这里重点注意： name里面的值为服务端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
sbFile.append("Content-Disposition: form-data; name=\""+fileName+"\"; filename=\""
+ file.getValue().getName() + "\"" + LINEND);
sbFile.append("Content-Type: application/octet-stream; charset="
+ CHARSET + LINEND);
sbFile.append(LINEND);
outStream.write(sbFile.toString().getBytes());


InputStream is = new FileInputStream(file.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1)
{
outStream.write(buffer, 0, len);
}
is.close();
outStream.write(LINEND.getBytes());
}
}


// 请求结束标志
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到响应码
int res = conn.getResponseCode();
InputStream in = conn.getInputStream();
StringBuilder sbResult = new StringBuilder();
if (res == 200)
{
int ch;
while ((ch = in.read()) != -1)
{
sbResult.append((char) ch);
}
}
result = sbResult.toString();
in.close();
outStream.close();
conn.disconnect();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
if(null != callback)
callback.onFinished(result);

}

}