Android开发中常用的工具类整理

发布时间：2024-12-09 21:19

移动开发：iOS/Android，了解移动应用开发流程。 #生活技巧# #工作学习技巧# #编程学习路径#

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();

}

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