Stream 工具方法

inputstream 转 string

1、使用字符流 
InputStream is = TestZhimaCustomerCertificationInitialize.class.getClassLoader().getResourceAsStream("config/rsa_private_key_pkcs8.pem");
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = null;
StringBuffer sb = new StringBuffer();
while ((line = br.readLine()) != null) {
sb.append(line);
}2、使用字节流
InputStream is = TestZhimaCustomerCertificationInitialize.class.getClassLoader().getResourceAsStream("config/rsa_private_key_pkcs8.pem");
byte b = new byte[1024];
int n;
StringBuffer sb = new StringBuffer();
while((n = is.read(b)) != -1) {
sb.append(new String(b,0,n))
}

 

 

package com.hy.springmvc.utils;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;public class StreamUtil {public static InputStream stringToInputStream(String str) {InputStream is = null;ByteArrayInputStream bais = null;try {bais = new ByteArrayInputStream(str.getBytes());is = bais;} catch (Exception e) {e.printStackTrace();} finally {try {bais.close();} catch (IOException e) {e.printStackTrace();}}return is;}public static String inputStreamToString(InputStream is) {String ret = null;byte[] b = new byte[1024];int n;ByteArrayOutputStream baos = new ByteArrayOutputStream();try {while ((n = is.read(b)) != -1) {baos.write(b, 0, n);}ret = new String(baos.toByteArray());} catch (Exception e) {e.printStackTrace();} finally {try {baos.close();} catch (IOException e) {e.printStackTrace();}}return ret;}public static OutputStream inputStreamToOutputStream(InputStream is)throws IOException {OutputStream os = new ByteArrayOutputStream();int ch;while ((ch = is.read()) != -1) {os.write(ch);}os.flush();os.close();return os;}public static InputStream outputStreamToInputStream(OutputStream os) {InputStream is = null;ByteArrayOutputStream baos = new ByteArrayOutputStream();baos = (ByteArrayOutputStream) os;is = new ByteArrayInputStream(baos.toByteArray());return is;}}