Android Http下载文件到手机内存与SDCard

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访问Internet和保存文件到SDCard上，首先要在mainifest.xml文件中加上下面的权限。

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

gettextfilestring(String url)获取文本文件内：

public String gettextfilestring(String url){
InputStream input =getinputStream(url);
StringBuffer sb = new StringBuffer("");
BufferedReader bfr = new BufferedReader(new InputStreamReader(input));
String line = "";
try {
while((line=bfr.readLine())!=null){
sb.append(line);
}

} catch (IOException e) {
toasterror("流文件读写错误");
e.printStackTrace();
}finally{
try {
bfr.close();
} catch (IOException e) {
toasterror("流文件未能正常关闭");
e.printStackTrace();
}
}
return sb.toString();

}

downFiletoDecive(String url,String filename)方法下载文件到设备内存，下载的文件在应用的路径file下：

public void downFiletoDecive(String url,String filename){
if((url!=null&&!"".equals(url))&&(filename!=null&&!"".equals(filename))){
InputStream input = getinputStream(url);
FileOutputStream outStream = null;
try {
outStream = c.openFileOutput(filename, Context.MODE_WORLD_READABLE|Context.MODE_WORLD_WRITEABLE);
int temp = 0;
byte[] data = new byte[1024];
while((temp = input.read(data))!=-1){
outStream.write(data, 0, temp);
}
} catch (FileNotFoundException e) {
toasterror("请传入正确的上下文");
e.printStackTrace();
} catch (IOException e) {
toastemessage("读写错误");
e.printStackTrace();
}finally{
try {
outStream.flush();
outStream.close();
} catch (IOException e) {
toasterror("流文件未能正常关闭");
e.printStackTrace();
}

}
}
toastemessage("下载成功");
}
downFiletoSDCard(String url,String path,String filename)下载文件到SDCard中，自定义保存路：

public void downFiletoSDCard(String url,String path,String filename){

if((url!=null&&!"".equals(url))&&(path!=null)&&(filename!=null&&!"".equals(filename))){

InputStream input = getinputStream(url);
downloader(input, path, filename);

}else{
/*
* 对不合发的参数做处理
*/
if(url==null||"".equals(url)){
toasterror("url不能为空或为“”");
}
if(path==null){
toasterror("path不能为空");
}
if(filename==null||"".equals(filename)){
toasterror("filename不能为空");
}
}

}
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