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;
    }

}