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;  }  }