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不要再說用<a>標(biāo)簽下載了,這個會把文件打開而不是下載

例如：

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j(luò)ava本身的文件讀寫來進(jìn)行文件的下載

									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(shè)置文件MIME類型 

									      response.setContentType(ServletActionContext.getServletContext().getMimeType(filename)); 

									      //設(shè)置Content-Disposition 

									      response.setHeader("Content-Disposition", "attachment;filename="+filename); 

									      //獲取目標(biāo)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(biāo)文件，通過response將目標(biāo)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;

									  }

									}