java中InputStream String

Java 中获取输入流时，有时候需要将输入流转成String,以便获取其中的内容 ，下面总结一下 InputStream 转成String 的方式

方法1：

public String convertStreamToString(InputStream is) {

BufferedReader reader = new BufferedReader(new InputStreamReader(is));

StringBuilder sb = new StringBuilder();



String line = null;

try {

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

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

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

is.close();

} catch (IOException e) {

e.printStackTrace();

}

}



return sb.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();

}

String 转成 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"));