Servlet中使用注解@Resource注入

masterwr 2017-11-01 03:34:03



package com.common;



import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.URLDecoder;

import java.util.Date;



import javax.annotation.Resource;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.springframework.stereotype.Component;

import org.springframework.stereotype.Repository;



import com.beans.domain.UserOperationLog;

import com.beans.useroperationlog.dao.UserOperationLogDao;

import com.beans.useroperationlog.manager.UserOperationLogManager;

import com.bstek.bdf2.core.business.IUser;

import com.bstek.bdf2.core.context.ContextHolder;



@Repository("servletDownload")

public class ServletDownload extends HttpServlet {  

    private static final long serialVersionUID = 1L;  

    

    @Resource(name="userOperationLogManager")

    private UserOperationLogManager userOperationLogManager;

         

    /** 

     * @see HttpServlet#HttpServlet() 

     */  

    public ServletDownload() {  

        super();  

        // TODO Auto-generated constructor stub  

    }  

  

    /** 

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 

     */  

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  

        // TODO Auto-generated method stub  

    	request.setCharacterEncoding("UTF-8");

        //获得请求文件名  

    	String filename = URLDecoder.decode(request.getParameter("filename"),"utf-8");

       // String filename = request.getParameter("filename"); 

        if(null==filename)

        	return;

        //System.out.println(filename);  

          

        //设置文件MIME类型  

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

        //设置Content-Disposition  

        String name = filename.substring(filename.lastIndexOf('/')+1,filename.length());

        response.setHeader("Content-Disposition", "attachment;filename="+new String(name.getBytes("gb2312"),"ISO8859-1")); 

        //读取目标文件，通过response将目标文件写到客户端  

        //获取目标文件的绝对路径  

        String fullFileName = getServletContext().getRealPath("/upload/" + filename);  

        //System.out.println(fullFileName);  

        //读取文件  

        InputStream in = new FileInputStream(fullFileName);



        OutputStream out = response.getOutputStream();



        int b;  

        while((b=in.read())!= -1)  

        {  

            out.write(b);  

        }  

        in.close();  

        out.close();  

        

        String tablename = URLDecoder.decode(request.getParameter("tablename"),"utf-8");

        System.out.println(tablename);

        IUser loginUser = ContextHolder.getLoginUser();

		String ucn = loginUser.getCname();

		String un = loginUser.getUsername();

		Date myDate = new Date();

        // 对用户下载操作进行记录，在用户操作日志表中新增一条记录。

		 

		try {

			

			//UserOperationLogDao userOperationLogDao = new UserOperationLogDao();

			//UserOperationLogDao userOperationLogDao = new UserOperationLogDao();

			//UserOperationLogManager userOperationLogManager = new UserOperationLogManager();

			userOperationLogManager.recordUserOperationLog("下载",myDate, un, ucn, "下载"+tablename);

		} catch (Exception e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

    }  

  

    /** 

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 

     */  

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  

        // TODO Auto-generated method stub  

    }  

  

}

@Resource(name="userOperationLogManager")注入实现数据持久化，但是下面的报错。
信息: Servlet fileDownloadServlet is currently unavailable
但是如果把@Resource去掉以后，userOperationLogManager中的
@Resource
private UserOperationLogDao userOperationLogDao;
便为空指针。

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