String与InputStream相互转换

1.String to InputStream

String str = "String与InputStream相互转换";

InputStream in_nocode = new ByteArrayInputStream(str.getBytes());
InputStream in_withcode = new ByteArrayInputStream(str.getBytes("UTF-8"));

2.InputStream to String

这里提供几个方法。

方法1：

publicStringconvertStreamToString(InputStreamis){

BufferedReaderreader=newBufferedReader(newInputStreamReader(is));

StringBuildersb=newStringBuilder();

 

Stringline=null;

try{

while((line=reader.readLine())!=null){

sb.append(line+"\n");

}

}catch(IOExceptione){

e.printStackTrace();

}finally{

try{

is.close();

}catch(IOExceptione){

e.printStackTrace();

}

}

 

returnsb.toString();

}

 

方法2：

public String inputStream2String (InputStream in) throws IOException {
StringBuffer out = new StringBuffer();
byte[] b = new byte[4096];
for (int n; (n = in.read(b)) != -1;) {
out.append(new String(b, 0, n));
}
return out.toString();
}

方法3：
public static String inputStream2String(InputStream is) throws IOException{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int i=-1;
while((i=is.read())!=-1){
baos.write(i);
}
return baos.toString();
}