java post图片，图片用base64编码

/**
 * Copy Right Information   :  
 * Project                  : 
 * JDK version used         :  
 * Comments                 :  
 * Version                  : 1.01
 * Author                   : Gordon Gu
 * Modification history     : 2011
 * Sr     Date       Modified By       Why & What is modified
 * 1.     2011       Gordon Gu         new
 **/
import java.io.*;
import java.net.*;


import sun.misc.BASE64Encoder;
public class ServletCom {
static String sessionId = "";

public static String getPicBASE64() {
String picPath="g:/zhuge.jpg";
String content = "";
try {
FileInputStream fileForInput = new FileInputStream(picPath);
byte[] bytes = new byte[fileForInput.available()];
fileForInput.read(bytes);
content = new sun.misc.BASE64Encoder().encode(bytes); // 具体的编码方法
fileForInput.close();
//System.out.println(content.length());
} catch (Exception e) {
e.printStackTrace();
}
return content;
}
  
public static void main(String[] args) throws Exception {
 
  // TODO Auto-generated method stub
URL url = new URL("http://localhost:8080/PicDownload/valide.action");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
// Read from the connection. Default is true.
connection.setDoInput(true);
// Set the post method. Default is GET
connection.setRequestMethod("POST");
// Post cannot use caches
// Post 请求不能使用缓存
connection.setUseCaches(false);
// This method takes effects to
// every instances of this class.
// URLConnection.setFollowRedirects是static函数，作用于所有的URLConnection对象。
// connection.setFollowRedirects(true);
// This methods only
// takes effacts to this
// instance.
// URLConnection.setInstanceFollowRedirects是成员函数，仅作用于当前函数
connection.setInstanceFollowRedirects(false);
// Set the content type to urlencoded,
// because we will write
// some URL-encoded content to the
// connection. Settings above must be set before connect!
// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的
// 意思是正文是urlencoded编码过的form参数，下面我们可以看到我们对正文内容使用URLEncoder.encode
// 进行编码
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成，
// 要注意的是connection.getOutputStream会隐含的进行connect。
connection.connect();
Long sendTime = System.currentTimeMillis();
DataOutputStream out = new DataOutputStream(connection.getOutputStream());
// 要传的参数
String content = URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode("XXX", "UTF-8");
content += "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode("XXXX", "UTF-8");
content += "&" + URLEncoder.encode("sendTime", "UTF-8") + "=" + URLEncoder.encode(sendTime.toString(), "UTF-8");
 //得到图片的base64编码
content = content + "&" + URLEncoder.encode("file", "UTF-8") + "=" + URLEncoder.encode(getPicBASE64(), "UTF-8");
out.writeBytes(content);
out.flush();
out.close(); // flush and close
//Get Session ID
String key = "";
if (connection != null)
{
for (int i = 1; (key = connection.getHeaderFieldKey(i)) != null; i++) 
{
if (key.equalsIgnoreCase("set-cookie"))
{
sessionId = connection.getHeaderField(key);
sessionId = sessionId.substring(0, sessionId.indexOf(";"));
}
}
}

 




// ------------------ read the SERVER RESPONSE
try {
DataInputStream inStream = new DataInputStream(connection.getInputStream());
String str;
if((str = inStream.readLine()) != null)
{
System.out.println("Server response is: " + str);
System.out.println("");
}
inStream.close();
} 
catch (IOException ioex) 
{
System.out.println("From (ServerResponse): " + ioex);
}
connection.disconnect();
}



}