package com.cloud.mina.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletResponse;
/***
* 下载文件工具类
*/
public class DownLoadUtil {
private static final String CONTENT_TYPE = "application/x-msdownload";
/**
* 下载文件
* @param response HttpServletResponse
* @param title 下载时候的文件名称
* @param file 要下载的文件对象
* @return true 下载成功 false 下载失败
*/
public static boolean downLoadFile(HttpServletResponse response,String filename,File file){
boolean result = true;
FileInputStream input = null;
OutputStream out = null;
try {
//设置response的编码方式
response.setContentType(CONTENT_TYPE);
//写明要下载的文件的大小
response.setContentLength((int)file.length());
//设置附加文件名
response.setHeader("Content-Disposition","attachment;filename=\""+new String
(filename.getBytes("UTF-8"),"iso-8859-1")+"\"");
//读出文件到i/o流
input =new FileInputStream(file);
//从response对象中得到输出流,准备下载
out = response.getOutputStream();
if(input!=null && out!=null){ // 判断输入或输出是否准备好
int temp = 0 ;
try{
while((temp=input.read())!=-1){ // 开始拷贝
out.write(temp) ; // 边读边写
}
}catch(IOException e){
e.printStackTrace() ;
result = false;
}
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
result = false;
} catch (IOException e) {
result = false;
e.printStackTrace();
} finally{
if(input!=null){
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
result = false;
}
}
if(out!=null){
try {
out.flush();
out.close();//关闭输出流
} catch (IOException e) {
e.printStackTrace();
result = false;
}
}
}
return result;
}
}
