javaweb+android（上传下载）

/** * <p>project_name：contacts</p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2011 by tl3shi.</p> **/ package com.qiaozi.luying; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.DataOutputStream; 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.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.Map; import android.os.Environment; import android.util.Log; /** * <p>Title: FileUtil.java</p> * <p>Description: </p> * @author <a href="mailto:[email protected]">Administrator</a> * @date 2011-3-3 下午03:28:05 * @version 1.0 */ public class FileUtil { private String SDPATH; private int FILESIZE = 4*1024; public String getSDPATH(){ return SDPATH; } public FileUtil(){ //得到当前外部存储设备的目录( /SDCARD ) SDPATH = Environment.getExternalStorageDirectory() + "/"; } /** * 在SD卡上创建文件 * @param fileName * @return * @throws IOException */ public File createSDFile(String fileName) throws IOException{ File file = new File(SDPATH + fileName); file.createNewFile(); return file; } /** * 在SD卡上创建目录 * @param dirName * @return */ public File createSDDir(String dirName){ File dir = new File(SDPATH + dirName); dir.mkdir(); return dir; } /** * 判断SD卡上的文件夹是否存在 * @param fileName * @return */ public boolean isFileExist(String fileName){ File file = new File(SDPATH + fileName); return file.exists(); } /** * 将一个InputStream里面的数据写入到SD卡中 * @param path * @param fileName * @param input * @return */ public File write2SDFromInput(String path,String fileName,InputStream input){ File file = null; OutputStream output = null; try { createSDDir(path); file = createSDFile(path + fileName); output = new FileOutputStream(file); byte[] buffer = new byte[FILESIZE]; while((input.read(buffer)) != -1){ output.write(buffer); } output.flush(); } catch (Exception e) { e.printStackTrace(); } finally{ try { if(null != output){ output.close(); } if(null != input){ input.close(); } } catch (IOException e) { e.printStackTrace(); } } return file; } /** * 直接通过HTTP协议提交数据到服务器,实现表单提交功能 * @param actionUrl 上传路径 * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */ public static String post(String actionUrl, Map<String, String> params, FormFile[] files) { try { String BOUNDARY = "---------7d4a6d158c9"; //数据分隔线 String MULTIPART_FORM_DATA = "multipart/form-data"; URL url = new URL(actionUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(6000); conn.setDoInput(true);//允许输入 conn.setDoOutput(true);//允许输出 conn.setUseCaches(false);//不使用Cache conn.setRequestMethod("POST"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Charset", "UTF-8"); conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA + "; boundary=" + BOUNDARY); StringBuilder sb = new StringBuilder(); //上传的表单参数部分，格式请参考文章 for (Map.Entry<String, String> entry : params.entrySet()) {//构建表单字段内容 sb.append("--"); sb.append(BOUNDARY); sb.append("\r\n"); sb.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n"); sb.append(entry.getValue()); sb.append("\r\n"); } DataOutputStream outStream = new DataOutputStream(conn.getOutputStream()); outStream.write(sb.toString().getBytes());//发送表单字段数据 FileInputStream fis = null; //上传的文件部分，格式请参考文章 for(FormFile file : files){ StringBuilder split = new StringBuilder(); split.append("--"); split.append(BOUNDARY); split.append("\r\n"); split.append("Content-Disposition: form-data;name=\""+ file.getFormname()+"\";filename=\""+ file.getFilname() + "\"\r\n"); split.append("Content-Type: "+ file.getContentType()+"\r\n\r\n"); outStream.write(split.toString().getBytes()); outStream.write(file.getData(), 0, file.getData().length); outStream.write("\r\n".getBytes()); } byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();//数据结束标志 outStream.write(end_data); outStream.flush(); int cah = conn.getResponseCode(); Log.i("userinfo", ""+cah); if (cah != 200) throw new RuntimeException("请求url失败"); InputStream is = conn.getInputStream(); InputStreamReader isr = new InputStreamReader(is, "utf-8");//解决乱码问题，保证服务器端返回数据正常显示 BufferedReader br = new BufferedReader(isr); String result = br.readLine(); outStream.close(); conn.disconnect(); return result; } catch (Exception e) { throw new RuntimeException(e); } } /** * 读取源文件内容 * @param filename String 文件路径 * @throws IOException * @return byte[] 文件内容 */ public static byte[] readFile(String filename) { File file =new File(filename); long len = file.length(); Log.i("userinfo", "file.length():"+len); byte[] bytes = new byte[(int)len]; BufferedInputStream bufferedInputStream; try { bufferedInputStream = new BufferedInputStream(new FileInputStream(file)); int r = bufferedInputStream.read( bytes ); if (r != len){ bufferedInputStream.close();} } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e){ e.printStackTrace(); } return bytes; } }