给安卓端调用的apk、图片下载接口

package com.js.ai.modules.pointwall.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.js.ai.common.utils.StringUtils;
import com.js.ai.common.web.BaseController;
/**
 * 
 * @ClassName: DownImgAction2
 * @Description: 客户端图片下载接口
 * @author: 
 * @date: 
 */
@Controller
@RequestMapping(value = "${adminPath}/client")
public class DownImgAction2 extends BaseController {
	private static Logger logger = Logger.getLogger(DownImgAction2.class);
	@RequestMapping(value = "downImg")
	@ResponseBody
	public void downImg(HttpServletRequest request, HttpServletResponse response) throws IOException {
		response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");
		response.setContentType("image/*");  
		HashMap<String, Object> map=new HashMap<String,Object>();
		String imgUrl = request.getParameter("imageUrl");//获取客户端发送的图片下载路径
		if(StringUtils.isNotBlank(imgUrl)){
			String rootPath = request.getSession().getServletContext().getRealPath(File.separator);
			File file = new File(rootPath + imgUrl);
			if (file.isFile()) {//文件存在
				System.out.println(rootPath + imgUrl);
				FileInputStream inputStream = new FileInputStream(file);
				OutputStream outputStream = response.getOutputStream();
				try {
					int count = 0;
					byte[] buffer = new byte[1024];
					while ((count = inputStream.read(buffer)) != -1) {
						outputStream.write(buffer, 0, count);
					}
					outputStream.flush();
				} catch (IOException e) {
					e.printStackTrace();
				}
				finally {
					if (outputStream != null) {
						try {
							outputStream.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
					if (inputStream != null) {
						try {
							inputStream.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}else {
			logger.info("图片下载路径不存在！");
			map.put("error", "图片下载路径不存在！");
		}
	}
}

　　

package com.js.ai.modules.pointwall.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;

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

import org.apache.fop.cli.Main;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.js.ai.common.utils.StringUtils;
import com.js.ai.common.web.BaseController;
import com.js.ai.modules.pointwall.entity.PointwallSystemVersons;
import com.js.ai.modules.pointwall.service.PointwallSystemVersonsService;
import com.js.ai.modules.pointwall.util.JsonHandle;

/**
 * 
 * @ClassName: ApkDownloadAction
 * @Description: 客户端Apk下载接口
 * @author: 
 * @date: 
 */
@Controller
@RequestMapping(value = "${adminPath}/client")
public class ApkDownloadAction2 extends BaseController {
	private static Logger logger = Logger.getLogger(ApkDownloadAction2.class);
   /**
    * 
    * @Title: apkDownload
    * @Description: TODO 更新最新版本
    * @param request
    * @param response
    * @throws IOException
    * @return: void
    */
	@RequestMapping(value = "apkDownload")
	@ResponseBody
	public void apkDownload(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");
		HashMap<String, Object> map=new HashMap<String,Object>();
		String  versionsUrl =request.getParameter("versionsUrl");//获取客户端发送的版本路径
		if(StringUtils.isNotBlank(versionsUrl)){
			String rootPath=request.getSession().getServletContext().getRealPath(File.separator);
			File file=new File(rootPath+versionsUrl);
			if(file.isFile()){//文件存在
				System.out.println(rootPath + versionsUrl);
				FileInputStream inputStream = new FileInputStream(file);
				OutputStream outputStream = response.getOutputStream();
				try {
					int count = 0;
					byte[] buffer = new byte[1024];
					while ((count = inputStream.read(buffer)) != -1) {
					outputStream.write(buffer, 0, count);
					}
					outputStream.flush();
				} catch (IOException e) {
					e.printStackTrace();
				}
				finally {
					if (outputStream != null) {
						try {
							outputStream.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
					if (inputStream != null) {
						try {
							inputStream.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}else {
			logger.info("版本路径不存在！");
			map.put("error", "版本路径不存在！");
		}
	}
}