不知道您有没有做过新闻管理软件,不知道对图片处理是不是用着很麻烦的方法呢?
本文将介绍一种方法,让您省时省力轻松完成图片问题.
1.问题原因:
我复制一篇新闻里面有新闻的图片,可是我想把这张图片改名上传到自己的空间上,一般的方法是将图片下载至本地,然后在例用上传组件上传至服务器,
2.解决方法:
/*
* Created on 2003-1-17
* CopyRight by http://www.designac.org
*/
package org.DesignAC.bean;
import java.io.*;
import java.net.*;
import org.DesignAC.util.Log.Logger;
import org.DesignAC.util.ErrorMessage;
import java.text.NumberFormat;
/**
* @author biggie
*
* Class Function:远程图片上传至服务器指定目录,指定更名
*/
public class downloadPic {
/** 日志 */
private Logger log=Logger.getInstance("downloadPic");
/** 错误信息bean*/
ErrorMessage ErrorMessage=null;
/** 远程图片地址 */
private String picurl;
/** 服务器相应该文件 */
private String savepath;
/** 无参数构造函数 */
public downloadPic(){
}
/**
* 构造函数
* @param picurl 远程图片地址
* @param savapath 服务器相应该文件
*/
public downloadPic(String picurl,String savepath){
this.picurl=picurl;
this.savepath=savepath;
NumberFormat nf = NumberFormat.getInstance();
nf.setMaximumIntegerDigits(
}
/**
* 远程下载至服务器
* @return true上传成功,false上传失败
*/
public boolean download(){
String fileurl=this.picurl;
String savepath=this.savepath;
try{
int httpStatusCode;
URL url =new URL(fileurl);
URLConnection conn = url.openConnection();
conn.connect();
HttpURLConnection httpconn =(HttpURLConnection)conn;
httpStatusCode =httpconn.getResponseCode();
if(httpStatusCode!=HttpURLConnection.HTTP_OK){
file://HttpURLConnection return an error code
log.error("Connect to "+fileurl+" failed,return code:"+httpStatusCode);
System.out.println("Connect to "+fileurl+" failed,return code:"+httpStatusCode);
return false;
}
int filelen = conn.getContentLength();
InputStream is = conn.getInputStream();
byte[] tmpbuf=new byte[1024];
File savefile =new File(savepath);
if(!savefile.exists())
savefile.createNewFile();
FileOutputStream fos = new FileOutputStream(savefile);
int readnum = 0;
if(filelen<0)//for http://www.csdn.net/expert/topic/204/204361.shtm, conn.getContentLength() return -1.
{
while(readnum>-1)
{
readnum = is.read(tmpbuf);
if(readnum>0)
fos.write(tmpbuf,0,readnum);
}
}
else
{
int readcount =0;
while(readcount<filelen&&readnum!=-1)
{
readnum=is.read(tmpbuf);
if(readnum>0)
{
fos.write(tmpbuf,0,readnum);
readcount =readcount +readnum;
}
}
if(readcount<filelen)
{
System.out.println("download error");
log.error("download error!");
is.close();
fos.close();
savefile.delete();
return false;
}
}
fos.flush();
fos.close();
is.close();
}
catch(Exception e)
{
e.printStackTrace();
return false;
}
return true;
}
}
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