jersey rest webservice实现上传下载

package com.teamhow.daoimpl;

import java.io.BufferedInputStream;
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.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

@Path("/images")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public class ImageResource {
?? ?private static final String SERVER_UPLOAD_LOCATION_FOLDER = "C://";

?? ?@POST
?? ?@Produces(MediaType.APPLICATION_JSON)
?? ?public String uploadStatePolicy(@Context HttpServletRequest request) {
?? ??? ?try {
?? ??? ??? ?String fileName = saveFile(request);
?? ??? ??? ?if (!fileName.equals("")) {
?? ??? ??? ?} else {

?? ??? ??? ?}
?? ??? ?} catch (Exception ex) {
?? ??? ?}
?? ??? ?return "";
?? ?}

?? ?/**
?? ? * 文件下载
?? ? *
?? ? * @throws UnsupportedEncodingException
?? ? * @throws IOException
?? ? */
?? ?@GET
?? ?@Path("/download")
?? ?@Produces(MediaType.TEXT_PLAIN)
?? ?public String downloadFile(@Context HttpServletRequest request,
?? ??? ??? ?@Context HttpServletResponse response,
?? ??? ??? ?@QueryParam("fileName") String fileName)
?? ??? ??? ?throws UnsupportedEncodingException {
?? ??? ?response.setContentType("text/html; charset=UTF-8");
?? ??? ?response.setCharacterEncoding("UTF-8");
?? ??? ?Boolean isOnLine = true; // 是否在线浏览
?? ??? ?// 得到下载文件的名字
?? ??? ?String fileNameStr = java.net.URLDecoder.decode(fileName,"utf-8");
?? ??? ?// 解决中文乱码问题
?? ??? ?// String filename=new
?? ??? ?// String(request.getParameter("filename").getBytes("iso-8859-1"),"gbk");

?? ??? ?StringBuffer path = new StringBuffer(fileNameStr);
?? ??? ?File file = new File(path.toString());
?? ??? ?FileInputStream fis = null;
?? ??? ?BufferedInputStream buff = null;
?? ??? ?OutputStream myout = null;
?? ??? ?try {
?? ??? ??? ?if (!file.exists()) {
?? ??? ??? ??? ?response.sendError(404,"File not found!");
?? ??? ??? ??? ?return "";
?? ??? ??? ?}
?? ??? ??? ?response.reset();
?? ??? ??? ?if (isOnLine) { // 在线打开方式
?? ??? ??? ??? ?URL u = new URL("file:///" + path.toString());
?? ??? ??? ??? ?response.setContentType(u.openConnection().getContentType());
?? ??? ??? ??? ?response.setHeader("Content-Disposition","inline; filename="
?? ??? ??? ??? ??? ??? ?+ new String(file.getName().getBytes("gbk"),
?? ??? ??? ??? ??? ??? ??? ??? ?"iso-8859-1"));
?? ??? ??? ?} else { // 纯下载方式
?? ??? ??? ??? ?// 设置response的编码方式
?? ??? ??? ??? ?response.setContentType("application/x-msdownload");
?? ??? ??? ??? ?// 写明要下载的文件的大小
?? ??? ??? ??? ?response.setContentLength((int) file.length());
?? ??? ??? ??? ?// 设置附加文件名(解决中文乱码)
?? ??? ??? ??? ?response.setHeader("Content-Disposition",
?? ??? ??? ??? ??? ??? ?"attachment;filename="
?? ??? ??? ??? ??? ??? ??? ??? ?+ new String(file.getName().getBytes("gbk"),
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?"iso-8859-1"));
?? ??? ??? ?}

?? ??? ??? ?fis = new FileInputStream(file);
?? ??? ??? ?buff = new BufferedInputStream(fis);
?? ??? ??? ?byte[] b = new byte[1024];// 相当于我们的缓存
?? ??? ??? ?long k = 0;// 该值用于计算当前实际下载了多少字节
?? ??? ??? ?// 从response对象中得到输出流,准备下载
?? ??? ??? ?myout = response.getOutputStream();
?? ??? ??? ?while (k < file.length()) {
?? ??? ??? ??? ?int j = buff.read(b,1024);
?? ??? ??? ??? ?k += j;
?? ??? ??? ??? ?// 将b中的数据写到客户端的内存
?? ??? ??? ??? ?myout.write(b,j);
?? ??? ??? ?}
?? ??? ??? ?// 将写入到客户端的内存的数据,刷新到磁盘
?? ??? ??? ?myout.flush();
?? ??? ?} catch (MalformedURLException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (FileNotFoundException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (IOException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} finally {
?? ??? ??? ?try {
?? ??? ??? ??? ?if (fis != null) {
?? ??? ??? ??? ??? ?fis.close();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?if (buff != null)
?? ??? ??? ??? ??? ?buff.close();
?? ??? ??? ??? ?if (myout != null)
?? ??? ??? ??? ??? ?myout.close();
?? ??? ??? ?} catch (Exception e) {
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?}
?? ??? ?}

?? ??? ?return "";
?? ?}


?? ?private String saveFile(HttpServletRequest request) {
?? ??? ?String fileName = "";
?? ??? ?try {
?? ??? ??? ?if (ServletFileUpload.isMultipartContent(request)) {
?? ??? ??? ??? ?FileItemFactory factory = new DiskFileItemFactory();
?? ??? ??? ??? ?ServletFileUpload upload = new ServletFileUpload(factory);
?? ??? ??? ??? ?List<FileItem> items = null;
?? ??? ??? ??? ?try {
?? ??? ??? ??? ??? ?items = upload.parseRequest(request);
?? ??? ??? ??? ?} catch (FileUploadException e) {
?? ??? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?if (items != null) {
?? ??? ??? ??? ??? ?Iterator<FileItem> iter = items.iterator();
?? ??? ??? ??? ??? ?while (iter.hasNext()) {
?? ??? ??? ??? ??? ??? ?FileItem item = iter.next();
?? ??? ??? ??? ??? ??? ?if (!item.isFormField() && item.getSize() > 0) {
?? ??? ??? ??? ??? ??? ??? ?fileName = processFileName(item.getName());
?? ??? ??? ??? ??? ??? ??? ?try {
?? ??? ??? ??? ??? ??? ??? ??? ?item.write(new File(
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?SERVER_UPLOAD_LOCATION_FOLDER
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?+ fileName));
?? ??? ??? ??? ??? ??? ??? ?} catch (Exception e) {
?? ??? ??? ??? ??? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ?} catch (Exception e) {
?? ??? ?}
?? ??? ?return fileName;
?? ?}

?? ?private String processFileName(String fileNameInput) {
?? ??? ?String fileNameOutput = null;
?? ??? ?fileNameOutput = fileNameInput.substring(
?? ??? ??? ??? ?fileNameInput.lastIndexOf("") + 1,fileNameInput.length());
?? ??? ?return fileNameOutput;
?? ?}

}

app中调用上传功能 使用了async-http异步请求开源项目。
public class HTTPCONFIG {
?? ?public static String IP = "http://192.168.191.1:8080/THwebservice/rest/";
?? ?public static String Method_UploadIcon = "images";
?? ?public static String Method_downloadimage = "images/download?fileName=";
}

private void fileupload() {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?String urlString = HTTPCONFIG.IP + HTTPCONFIG.Method_UploadIcon;
?? ??? ?InputStream myInputStream = null;
?? ??? ?try {
?? ??? ??? ?myInputStream = new FileInputStream(picFileFullName);
?? ??? ?} catch (IOException e1) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e1.printStackTrace();
?? ??? ?}
?? ??? ?RequestParams params = new RequestParams();
?? ??? ?params.put("secret_passwords",myInputStream,clanname + ".png");
?? ??? ?HttpUtil.post(urlString,params,new AsyncHttpResponseHandler() {

?? ??? ??? ?@Override
?? ??? ??? ?public void onSuccess(int statusCode,Header[] headers,
?? ??? ??? ??? ??? ?byte[] responseBody) {
?? ??? ??? ??? ?// TODO Auto-generated method stub
?? ??? ??? ??? ?Toast("创建成功");
?? ??? ??? ??? ?Message msg = new Message();
?? ??? ??? ??? ?msg.what = 1;
?? ??? ??? ??? ?handler.sendMessage(msg);

?? ??? ??? ??? ?new File(picFileFullName).delete();
?? ??? ??? ?}

?? ??? ??? ?@Override
?? ??? ??? ?public void onFailure(int statusCode,
?? ??? ??? ??? ??? ?byte[] responseBody,Throwable error) {
?? ??? ??? ??? ?// TODO Auto-generated method stub
?? ??? ??? ??? ?Toast("创建失败，请重试");
?? ??? ??? ?};
?? ??? ?});
?? ?}

下载功能?

直接在url上面加上文件名即可

比如 http://192.168.191.1:8080/THwebservice/rest/images/download?fileName=123.png