将本地图片或者网上图片用post方式上传到图片服务器

本文介绍了一种从网络上获取图片并将其转换为Base64编码字符串的方法，然后通过HTTP POST请求发送这些字符串到服务器。服务器端接收该字符串并解码为图片文件保存。

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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();  
        }  
          
    }  
  
}