springMVC实现文件的上传下载

package com.yibei.controller.admin;
/** 文件上传controller
* @author 陈伟 E-mail: [email protected]
* @version 创建时间：2017年7月6日 下午2:28:08 
* 类说明 
*/

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.yibei.entity.App;
import com.yibei.entity.PageBean;
import com.yibei.service.AppService;
import com.yibei.service.TypeService;
import com.yibei.util.DateUtil;
import com.yibei.util.ResponseUtil;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
@Controller
@RequestMapping("admin/apk")
public class AppAdminController {
	
	@Resource
	private AppService appService;
	@Resource
	private TypeService typeService;
	
	/**
	 * 上传apk文件
	 * @param apkFile
	 * @param app
	 * @param request
	 */
	private void upApk(MultipartFile apkFile,App app,HttpServletRequest request){
		if(apkFile.isEmpty()){
			System.out.println("未选择上传的apk文件");
		}else{
			String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/"+app.getType().getDir());
			try {
				FileUtils.copyInputStreamToFile(apkFile.getInputStream(), new File(realPath,apkFile.getOriginalFilename()));
				app.setSize(apkFile.getSize());
				app.setFullName(apkFile.getOriginalFilename());
				System.out.println("apk文件上传成功 ");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				System.out.println("上传apk出现异常");
			}
		}
	}
	/**
	 * 上传图标
	 * @param iconFile
	 * @param app
	 * @param request
	 * @throws Exception
	 */
	private void upIcon(MultipartFile iconFile,App app,HttpServletRequest request) throws Exception{
		if(iconFile.isEmpty()){
			System.out.println("未选择上传的apk图标");
		}else{
			String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/icon");
			try {
				String suffix = iconFile.getOriginalFilename().substring(iconFile.getOriginalFilename().lastIndexOf(".")+1);
				String fullName =DateUtil.getCurrentDateStr()+"."+suffix;
				FileUtils.copyInputStreamToFile(iconFile.getInputStream(), new File(realPath,fullName));
				app.setIcon(fullName);
				System.out.println("图标上传成功 ");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				System.out.println("上传图标出现异常");
			}
		}
	}
	/**
	 * 实现apk的下载
	 * @param id
	 * @param response
	 * @param request
	 */
	@RequestMapping("load")
	public void download(@RequestParam Integer id,HttpServletResponse response,HttpServletRequest request)  {
		OutputStream os =null;
		if(id!=null){
			App app = appService.getById(id);
			try {
				 os = response.getOutputStream();
				 response.reset();  
				 response.setContentType("application/octet-stream; charset=utf-8");  
				 response.setHeader("Content-Disposition", "attachment; filename="+URLEncoder.encode(app.getFullName(),"utf-8"));  
			     os.write(FileUtils.readFileToByteArray(getDictionaryFile(request,app)));  
			     os.flush(); 
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				if(os !=null){
					try {
						os.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
			if(app==null) return ;
		}
		
		
		
		
		
	}
	private File getDictionaryFile(HttpServletRequest request,App app){
		File file = new File(request.getSession().getServletContext().getRealPath("/WEB-INF/"+app.getType().getDir()+"\\"+app.getFullName()));
		System.out.println(request.getSession().getServletContext().getRealPath("/WEB-INF/"+app.getType().getDir()+"\\"+app.getFullName()));
		return file;
	}
	/**
	 * 罗列服务端上传的apk记录
	 * @param page
	 * @param rows
	 * @param response
	 * @return
	 * @throws Exception
	 */
	@RequestMapping("list")
	public String list(@RequestParam(value="page",required=false)String page,@RequestParam(value="rows",required=false)String rows,HttpServletResponse response)throws Exception{
		PageBean pageBean = new PageBean(Integer.parseInt(page),Integer.parseInt(rows));
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("start", pageBean.getStart());
		map.put("size", pageBean.getPageSize());
		List<App> appList = appService.getAppList(map);
		Long total = appService.getTotal();
		JSONObject result = new JSONObject();
		JsonConfig jsonConfig = new JsonConfig();
		jsonConfig.registerJsonValueProcessor(java.util.Date.class, new DateJsonValueProcessor("yyyy-MM-dd"));
		JSONArray jsonArray = JSONArray.fromObject(appList, jsonConfig);
		result.put("rows", jsonArray);
		result.put("total", total);
		ResponseUtil.write(response, result);
		return null;
	}
	/**
	 * 更新或添加app记录
	 * @param app
	 * @param apkFile
	 * @param iconFile
	 * @param response
	 * @param request
	 * @return
	 * @throws Exception
	 */
	@RequestMapping("/save")
	public String save(App app,@RequestParam MultipartFile apkFile,@RequestParam MultipartFile iconFile,HttpServletResponse response,HttpServletRequest request)throws Exception{
		int resultTotal=0; 
		JSONObject result=new JSONObject();

		if(!iconFile.isEmpty()){
			this.upIcon(iconFile, app, request);
			
		}
		
		if(app.getType().getId()==null) {
			result.put("success", false);
			ResponseUtil.write(response, result);
			return null;
		}
		app.setType(typeService.getById(app.getType().getId()));
		if(app.getId()==null){
			this.upApk(apkFile, app, request);
			resultTotal=appService.add(app);
		}else{
			this.upApk(apkFile, app, request);
			resultTotal = appService.update(app);
		}
		if(resultTotal>0){
			result.put("success", true);
		}else{
			result.put("success", false);
		}
		ResponseUtil.write(response, result);
		return null;
	}
	/**
	 * 删除app记录
	 * @param ids
	 * @param response
	 * @param request
	 * @return
	 * @throws Exception
	 */
	@RequestMapping("/delete")
	public String delete(@RequestParam(value="ids",required=false)String ids,HttpServletResponse response,HttpServletRequest request)throws Exception{
		JSONObject result = new JSONObject();
		 String []idsStr = ids.split(",");
		 for(int i=0;i<idsStr.length;i++){
			 App app = appService.getById(Integer.parseInt(idsStr[i]));
			 this.deleteApk(app, request);
			 appService.delete(Integer.parseInt(idsStr[i]));
		 }	
		 result.put("success", true);
		 ResponseUtil.write(response, result);
		return null;
	}
	/**
	 * 使得前台接收的String类型的日期能够自动封装到实体bean中Date类型的属性字段中
	 * @param request
	 * @param binder
	 */
	@InitBinder
    protected void init(HttpServletRequest request, ServletRequestDataBinder binder) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        dateFormat.setLenient(false);
        binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, false));
    }
	/**
	 * 在删除app记录的同时将存储在服务端的apk删除
	 * @param app
	 * @param request
	 */
	private void deleteApk(App app ,HttpServletRequest request){
		String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/"+app.getType().getDir());
		FileUtils.deleteQuietly(new File(realPath+"\\"+app.getFullName()));
		System.out.println("文件已删除");
	}
}

 实体bean

package com.yibei.entity;

import java.util.Date;

/**
 * app实体
 * @author cielab
 *
 */
public class App {
	
	private Integer id;
	private String name;
	private String suffix;
	private Type type;
	private String version;
	private String des;
	private float size;
	private String icon;
	private String log;
	private String info;
	private Date release_date;
	private String fullName;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSuffix() {
		return suffix;
	}
	public void setSuffix(String suffix) {
		this.suffix = suffix;
	}
	public Type getType() {
		return type;
	}
	public void setType(Type type) {
		this.type = type;
	}
	public String getVersion() {
		return version;
	}
	public void setVersion(String version) {
		this.version = version;
	}

	public String getDes() {
		return des;
	}
	public void setDes(String des) {
		this.des = des;
	}
	public float getSize() {
		return size;
	}
	public void setSize(float size) {
		this.size = size;
	}
	public String getIcon() {
		return icon;
	}
	public void setIcon(String icon) {
		this.icon = icon;
	}
	public String getLog() {
		return log;
	}
	public void setLog(String log) {
		this.log = log;
	}
	public String getInfo() {
		return info;
	}
	public void setInfo(String info) {
		this.info = info;
	}
	public Date getRelease_date() {
		return release_date;
	}
	public void setRelease_date(Date release_date) {
		this.release_date = release_date;
	}
	public String getFullName() {
		return fullName;
	}
	public void setFullName(String fullName) {
		this.fullName = fullName;
	}

	
	
}

package com.yibei.entity;
/** 
 * 应用类别实体
* @author 陈伟 E-mail: [email protected]
* @version 创建时间：2017年7月7日 上午8:48:25 
* 类说明 
*/
public class Type {
	
	private Integer id;
	private String name;
	private String dir;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDir() {
		return dir;
	}
	public void setDir(String dir) {
		this.dir = dir;
	}
	
}

package com.yibei.entity;

/**
 * 
 * @author 
 *
 */
public class PageBean {

	private int page; 
	private int pageSize; 
	private int start; 
	
	
	public PageBean(int page, int pageSize) {
		super();
		this.page = page;
		this.pageSize = pageSize;
	}
	
	public int getPage() {
		return page;
	}
	public void setPage(int page) {
		this.page = page;
	}
	
	public int getPageSize() {
		return pageSize;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

	public int getStart() {
		return (page-1)*pageSize;
	}
	
	
}