通过servlet实现文件下载,打开页面就能下载。
Demo1.java
package com.cx;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Demo1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//下载文件demo
//获取文件真实地址
String path = this.getServletContext().getRealPath("/download/截图.png");
//截取path中的文件名称
String filename = path.substring(path.lastIndexOf("\\")+1);
//初始化输入输出流
InputStream in = null;
OutputStream out = null;
//写head,处理中文名称时要进行url编码
response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(filename,"UTF-8"));
//处理下载
try{
//读取文件
in = new FileInputStream(path);
int len = 0;
byte[] buffer = new byte[1024];
out = response.getOutputStream();
while((len = in.read(buffer)) > 0){
out.write(buffer, 0, len);
}
}finally{
if(in != null){
try{
in.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
图片路径放在webroot/download下