天海544 / android / Android开发中常用的工具类整理

分享

   

Android开发中常用的工具类整理

2015-03-23  天海544
package net.wujingchao.android.utility
import android.content.Context;
import android.os.Environment;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File; 
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream; 
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.UUID;
import com.mixiaofan.App;
public class DownloadUtil {
     private static final int TIME_OUT = 30*1000; //超时时间
     private static final String CHARSET = "utf-8"//设置编码
     private DownloadUtil() {
        throw new UnsupportedOperationException("DownloadUtil cannot be instantiated");
     }
    /**
     * @param file  上传文件
     * @param RequestURL 上传文件URL
     * @return 服务器返回的信息,如果出错则返回为null
     */
     public static String uploadFile(File file,String RequestURL) {
         String BOUNDARY = UUID.randomUUID().toString(); //边界标识 随机生成 String PREFIX = "--" , LINE_END = "\r\n";
         String PREFIX = "--" , LINE_END = "\r\n";
         String CONTENT_TYPE = "multipart/form-data"//内容类型
         try {
             URL url = new URL(RequestURL);
             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
             conn.setReadTimeout(TIME_OUT);
             conn.setConnectTimeout(TIME_OUT);
             conn.setDoInput(true); //允许输入流
             conn.setDoOutput(true); //允许输出流
             conn.setUseCaches(false); //不允许使用缓存 
             conn.setRequestMethod("POST"); //请求方式 
             conn.setRequestProperty("Charset", CHARSET);
             conn.setRequestProperty("Cookie""PHPSESSID=" + App.getSessionId());
             //设置编码 
             conn.setRequestProperty("connection""keep-alive"); 
             conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);
             if(file!=null) { 
                     /** * 当文件不为空,把文件包装并且上传 */
                     OutputStream outputSteam=conn.getOutputStream();
                     DataOutputStream dos = new DataOutputStream(outputSteam);
                     StringBuffer sb = new StringBuffer();
                     sb.append(PREFIX);
                     sb.append(BOUNDARY); sb.append(LINE_END);
                     /**
                     * 这里重点注意:
                     * name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
                     * filename是文件的名字,包含后缀名的 比如:abc.png
                     */
                     sb.append("Content-Disposition: form-data; name=\"img\"; filename=\""+file.getName()+"\""+LINE_END);
                     sb.append("Content-Type: application/octet-stream; charset="+CHARSET+LINE_END);
                     sb.append(LINE_END);
                     dos.write(sb.toString().getBytes());
                     InputStream is = new FileInputStream(file);
                     byte[] bytes = new byte[1024];
                     int len;
                     while((len=is.read(bytes))!=-1)
                     {
                        dos.write(bytes, 0, len);
                     }
                     is.close();
                     dos.write(LINE_END.getBytes());
                     byte[] end_data = (PREFIX+BOUNDARY+PREFIX+LINE_END).getBytes();
                     dos.write(end_data);
                     dos.flush();
                     /**
                     * 获取响应码 200=成功
                     * 当响应成功,获取响应的流
                     */
                     ByteArrayOutputStream bos = new ByteArrayOutputStream();
                     InputStream resultStream = conn.getInputStream();
                     len = -1;
                     byte [] buffer = new byte[1024*8];
                     while((len = resultStream.read(buffer)) != -1) {
                         bos.write(buffer,0,len);
                     }
                     resultStream.close();
                     bos.flush();
                     bos.close();
                     String info = new String(bos.toByteArray());
                     int res = conn.getResponseCode();
                     if(res==200){
                        return info;
                     }else {
                         return null;
                     }
                }
               catch (MalformedURLException e) {
                    e.printStackTrace();
               catch (ProtocolException e) {
                    e.printStackTrace();
               catch (FileNotFoundException e) {
                    e.printStackTrace();
               catch (IOException e) {
                     e.printStackTrace();
               }
         return null;
     }
     public static byte[] download(String urlStr) {
            HttpURLConnection conn = null;
            InputStream is = null;
            byte[] result = null;
            ByteArrayOutputStream bos = null;
            try {
                URL url = new URL(urlStr);
                conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                conn.setConnectTimeout(TIME_OUT);
                conn.setReadTimeout(TIME_OUT);
                conn.setDoInput(true);
                conn.setUseCaches(false);//不使用缓存
                if(conn.getResponseCode() == 200) {
                    is = conn.getInputStream();
                    byte [] buffer = new byte[1024*8];
                    int len;
                    bos = new ByteArrayOutputStream();
                    while((len = is.read(buffer)) != -1) {
                        bos.write(buffer,0,len);
                    }
                    bos.flush();
                    result = bos.toByteArray();
                }
            catch (MalformedURLException e) {
                e.printStackTrace();
            catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if(bos != null){
                        bos.close();
                    }
                    if (is != null) {
                        is.close();
                    }
                    if (conn != null)conn.disconnect();
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return result;
        }
    /**
     * 获取缓存文件
     */
     public static File getDiskCacheFile(Context context,String filename,boolean isExternal) {
        if(isExternal && (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))) {
            return new File(context.getExternalCacheDir(),filename);
        }else {
            return new File(context.getCacheDir(),filename);
        }
    }
    /**
     * 获取缓存文件目录
     */
     public static File getDiskCacheDirectory(Context context) {
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            return context.getExternalCacheDir();
        }else {
            return context.getCacheDir();
        }
    }
 }

    本站是提供个人知识管理的网络存储空间,所有内容均由用户发布,不代表本站观点。请注意甄别内容中的联系方式、诱导购买等信息,谨防诈骗。如发现有害或侵权内容,请点击一键举报。

    0条评论

    发表

    请遵守用户 评论公约

    类似文章 更多
    喜欢该文的人也喜欢 更多

    ×
    ×

    ¥.00

    微信或支付宝扫码支付:

    开通即同意《个图VIP服务协议》

    全部>>