java读取输入流两种
private static byte[] readStream(InputStream in){
if(in==null){
return null;
}
byte[] buffer = null;
try {
int availableLength = 0;
while(availableLength==0){
availableLength = in.available();//可获取的字节流长度
if(availableLength==0&&in.read()==-1){//防止读取流返回为空造成死循环
break;
}
}
buffer = new byte[availableLength];
int readCount = 0;
while(readCount<availableLength){
readCount += in.read(buffer, readCount, availableLength-readCount);
}
} catch (IOException e) {
e.printStackTrace();
} finally{
if(in!=null){
try {
in.close();
in = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
return buffer;
}
public static byte[] readStream1(InputStream in) {
byte[] b = null;
ByteArrayOutputStream outSteam = null;
try {
byte[] buffer = new byte[1024 * 4];
outSteam = new ByteArrayOutputStream();
int len = -1;
while ((len = in.read(buffer)) != -1) {
outSteam.write(buffer, 0, len);
}
b = outSteam.toByteArray();
} catch (IOException e) {
e.printStackTrace();
} finally{
try {
if(outSteam!=null){
outSteam.close();
outSteam = null;
}
if(in!=null){
in.close();
in = null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
return b;
}