String与InputStream的互相转换

String to InputStream

InputStream String2InputStream(String str){
ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());
return stream;
}

InputStream to String

public static String inputStream2String(InputStream in_st){
BufferedReader in = new BufferedReader(new InputStreamReader(in_st));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = in.readLine()) != null){
buffer.append(line);
}
return buffer.toString();
}

public static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
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();
}

// 引入apache的io包
import org.apache.commons.io.IOUtils;

InputStream in = con.getInputStream();
String result = IOUtils.toString(in, "UTF-8");