javaweb 实现文件下载
不要再说用<a>标签下载了,这个会把文件打开而不是下载
例如：
<a href="E:/MyDesktop/37fecd65330184de67d419a8d02e7081.jpg">下载</a>
如果我这样写，浏览器就会把图片直接打开，除非是一个浏览器打不开的文件
所以我们还是要用到java本身的文件读写来进行文件的下载
<a href="downloadFile?filename=<s:property value='document_filename'/>">下载</a>
package com.cpsec.tang.chemical.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.List;import java.util.Random;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import org.springframework.stereotype.Controller;import com.cpsec.tang.chemical.biz.DocumentBiz;import com.cpsec.tang.chemical.entity.Document;import com.cpsec.tang.chemical.util.Pager;import com.opensymphony.xwork2.ActionSupport;@Controller("documentAction")public class DocumentAction extends ActionSupport{private String filename; public String downloadFile(){ System.out.println(filename); try { HttpServletResponse response=ServletActionContext.getResponse(); //设置文件MIME类型 response.setContentType(ServletActionContext.getServletContext().getMimeType(filename)); //设置Content-Disposition response.setHeader("Content-Disposition", "attachment;filename="+filename); //获取目标文件的绝对路径 String fullFileName = ServletActionContext.getServletContext().getRealPath("/files/" + filename); //System.out.println(fullFileName); //读取文件 InputStream in = new FileInputStream(fullFileName); //读取目标文件，通过response将目标文件写到客户端 OutputStream out = response.getOutputStream(); //写文件 int b; while((b=in.read())!= -1) { out.write(b); } in.close(); out.close(); } catch (Exception e) { e.printStackTrace(); } return SUCCESS; } }感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！