javaweb 實現文件下載
不要再說用<a>標籤下載了,這個會把文件打開而不是下載
例如：
<a href="E:/MyDesktop/37fecd65330184de67d419a8d02e7081.jpg">下載</a>
如果我這樣寫，瀏覽器就會把圖片直接打開，除非是一個瀏覽器打不開的文件
所以我們還是要用到java本身的文件讀寫來進行文件的下載
<a href="downloadFile?filename=<s:property value='document_filename'/>">下載</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(); //設置文件MIME類型response.setContentType(ServletActionContext.getServletContext().getMimeType(filename)); //設置Content-Disposition response.setHeader("Content-Disposition", "attachment;filename="+filename); //獲取目標文件的絕對路徑String fullFileName = ServletActionContext.getServletContext().getRealPath("/files/" + filename); //System.out.println(fullFileName); //讀取文件InputStream in = new FileInputStream(fullFileName); //讀取目標文件，通過response將目標文件寫到客戶端OutputStream out = response.getOutputStream(); //寫文件int b; while((b=in.read())!= -1) { out.write(b); } in.close(); out.close(); } catch (Exception e) { e.printStackTrace(); } return SUCCESS; } }感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！