package com.xin.stream;import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.nio.file.Files;import java.nio.file.Paths;import java.util.Scanner;import org.apache.commons.io.IOUtils;import com.google.common.io.CharStreams;public class StreamUtil {    /**     * 将字符串转换为InputStream     * @param str     * @return     */    public InputStream string2InputStream(String str){        return new ByteArrayInputStream(str.getBytes());    }    /**     * 采用jdk 的scanner 支持jdk1.5以上版本     * @param is     * @return     */    public String inputStream2String_Scanner(InputStream is){//        InputStream inputStream = new FileInputStream("d:/sample.txt");        StringBuilder  stringBuilder = new StringBuilder();        Scanner scanner = new Scanner(is);        while(scanner.hasNext()){            String text = scanner.useDelimiter("\\A").next();            stringBuilder.append(text);        }        scanner.close();        return stringBuilder.toString();    }    /**     * JDK1.4 及之前的 BufferedReader 法     * @param is     * @return     */    public String inputStream2String_BufferReader(InputStream is){        StringBuilder stringBuilder = new StringBuilder();        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));        String line = null; ;        try {            while((line = bufferedReader.readLine()) != null){                stringBuilder.append(line);            }        } catch (IOException e) {            e.printStackTrace();        }        return stringBuilder.toString();    }    /**     *  JDK1.4 及之前的 readBytes 法     * 缓冲区的大小自己根据实际来调，比 BufferedReader 还简洁些，不需管换行符的事情。     * @param is     * @return     * @throws IOException     */    public String inputStream2String_bytes(InputStream is) throws IOException{        StringBuilder stringBuilder = new StringBuilder();                byte[] buffer = new byte[1024];        int readBytes = 0;        while((readBytes = is.read(buffer)) > 0){            stringBuilder.append(new String(buffer, 0, readBytes));        }        return stringBuilder.toString();    }    /**     * Apache commons IOUtils.toString 法     * 第三方库就是第三方库，人家充分考虑到了你的感受，你对 JDK 库的抱怨，多简洁，一行搞定。     * IOUtils 还能把内容拷入其他的 Writer 中，如 IOUtils.copy(inputStream, new StringWriter())。     * @param is     * @return     * @throws IOException     */    public String inputStream2String_IOUtils(InputStream is) throws IOException{        return IOUtils.toString(is);    }    /**     * Google guava 的  CharStreams 方法     * CharSteams 不是直接作用在 InputSteam 上的，还要靠 InputStreamReader 拱个桥。     * @param is     * @return     * @throws IOException      * @throws UnsupportedEncodingException      */    public String inputStream2String_CharStreams(InputStream is) throws UnsupportedEncodingException, IOException{        return CharStreams.toString(new InputStreamReader(is, "UTF-8"));    }    /**     *  JDK 7 的 NIO readAllBytes     * @param path 读取文件路径 C:\\Users\\Administrator\\Desktop\\ChinaNet上网密码.txt     * @return     * @throws IOException      */    public String inputStream2String_readAllBytes(String path) throws IOException{        byte[] bytes = Files.readAllBytes(Paths.get(path));        String text = new String(bytes);        return text;    }}