将本地图片或者网上图片用post方式上传到图片服务器

一个简单的应用

package com.bj95ol.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class SendImgToWeb {
	/**
	 * 获得网络图片地址。或者图片地址
	 * @param url
	 * @return
	 */
	public String getContentFromWeb(String url)
	{
		String filecontent="";
		InputStream is=null;
		BASE64Encoder base=new BASE64Encoder();
		if(url.startsWith("http"))
		{
			try {
				HttpURLConnection urlconn=(HttpURLConnection)new URL(url).openConnection();
				is=urlconn.getInputStream();
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		int n=0;
		byte[] b=null;
		try {
			while((n=is.available())>0)
			{
				n=is.read(b);
				if(n==-1)break;
				filecontent=filecontent+base.encode(b);

			}
			is.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return filecontent;
	}

	/**
	 * 将图片内容用post方式发送到url中
	 * @param url
	 * @param postcontent
	 */

	public void sendImgbyPost(String url,String postcontent)
	{
		try {
			HttpURLConnection huc=(HttpURLConnection)new URL(url).openConnection();
			huc.setDoInput(true);
			huc.setDoOutput(true);
			huc.setRequestMethod("POST");

			PrintWriter pw=new PrintWriter(new OutputStreamWriter(huc.getOutputStream()));
			pw.print(postcontent);
			pw.close();

			BufferedReader br=new BufferedReader(new InputStreamReader(huc.getInputStream()));
			String content="";
			String line=br.readLine();
			while(line!=null)
			{
				content=content+line;
				line=br.readLine();

			}

		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
	/**
	 * 在服务器端获取发送过来的内容
	 * @param request
	 * @return
	 */
	public String receiveContent(HttpServletRequest request)
	{
		int a = 0;
		 byte[] b = new byte[4096];
		String result="";
		try
		{
		 ServletInputStream sis=request.getInputStream();
		int line=sis.readLine(b, 0, b.length);
		while(line!=-1)
		{
		result=result+new String(b,0,line);
		line=sis.readLine(b, 0, b.length);
		}
		}
		catch(Exception e)
		{
		e.printStackTrace();
		}
		return  result;
	}

	/**
	 * 将接受过来的信息生成文件
	 * @param request
	 * @param filename
	 */
	public void createFile(HttpServletRequest request,String filename)
	{
		File file=new File(filename);
		try {
			FileOutputStream fos=new FileOutputStream(file);
			String content=receiveContent(request);
			BASE64Decoder base=new BASE64Decoder();
			byte[] b=base.decodeBuffer(content);
			fos.write(b);
			fos.close();

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

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