Android学习笔记-InputStream与String,Byte之间的相互转换

/**
* Created by yt on 2017/12/15.
* InputStream工具类
*/
public class InputStreamUtils {

final static int BUFFER_SIZE = 4096;

/**
* 将InputStream转换成String
* @param in InputStream
* @return String
* @throws Exception
*
*/
public static String InputStreamTOString(InputStream in) throws Exception{

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] data = new byte[BUFFER_SIZE];
int count = -1;
while((count = in.read(data,0,BUFFER_SIZE)) != -1)
outStream.write(data, 0, count);

data = null;
//new String(outStream.toByteArray());
return new String(outStream.toByteArray(),"UTF-8");
}

public static String readStreamToString(InputStream inputStream) throws IOException {
//创建字节数组输出流 ，用来输出读取到的内容
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
//创建读取缓存,大小为1024
byte[] buffer = new byte[1024];
//每次读取长度
int len = 0;
//开始读取输入流中的文件
while( (len = inputStream.read(buffer) ) != -1){ //当等于-1说明没有数据可以读取了
byteArrayOutputStream.write(buffer,0,len); // 把读取的内容写入到输出流中
}
//把读取到的字节数组转换为字符串
String result = new String(byteArrayOutputStream.toByteArray());

//关闭输入流和输出流
inputStream.close();
byteArrayOutputStream.close();
//返回字符串结果
return result;
}

/**
* 将InputStream转换成某种字符编码的String
* @param in
* @param encoding
* @return
* @throws Exception
*/
public static String InputStreamTOString(InputStream in,String encoding) throws Exception{

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] data = new byte[BUFFER_SIZE];
int count = -1;
while((count = in.read(data,0,BUFFER_SIZE)) != -1)
outStream.write(data, 0, count);

data = null;
return new String(outStream.toByteArray(),"UTF-8");
}

/**
* 将String转换成InputStream
* @param in
* @return
* @throws Exception
*/
public static InputStream StringTOInputStream(String in) throws Exception{

ByteArrayInputStream is = new ByteArrayInputStream(in.getBytes("UTF-8"));
return is;
}

/**
* 将InputStream转换成byte数组
* @param in InputStream
* @return byte[]
* @throws IOException
*/
public static byte[] InputStreamTOByte(InputStream in) throws IOException{

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] data = new byte[BUFFER_SIZE];
int count = -1;
while((count = in.read(data,0,BUFFER_SIZE)) != -1)
outStream.write(data, 0, count);

data = null;
return outStream.toByteArray();
}

/**
* 将byte数组转换成InputStream
* @param in
* @return
* @throws Exception
*/
public static InputStream byteTOInputStream(byte[] in) throws Exception{

ByteArrayInputStream is = new ByteArrayInputStream(in);
return is;
}

/**
* 将byte数组转换成String
* @param in
* @return
* @throws Exception
*/
public static String byteTOString(byte[] in) throws Exception{

InputStream is = byteTOInputStream(in);
return InputStreamTOString(is);
}

}