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原文：java常用流处理工具StreamTool 常见的InputStream流转字符串, 转字节数组等等
源代码下载：http://www.zuidaima.com/share/1550463397366784.htm
ava 常用流处理工具 StreamTool ，常见的InputStream 流转字符串, 转字节数组等等
**应用场景：
** 1. 文件上传
2. js / css / img 等文件读取输出。 转字符串输出 (js & css) , 转字节数组输出 (img .. swf etc...)
3. 抓取指定 URL 连接的资源。
例如读取 javaniu 首页的 HTML 源代码
4. 如你所见....
/** Copyright 2012-2013 The Haohui Network Corporation*/
package com.zuidaima.haohui.common.utils;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;/*** <pre>* Java 常用流处理工具* </pre>* * @project baidamei* @author cevencheng <cevencheng@gmail.com> www.zuidaima.com* @create 2012-11-29 下午5:17:32*/
public class StreamTool {/*** 将流另存为文件* * @param is* @param outfile*/public void streamSaveAsFile(InputStream is, File outfile) {FileOutputStream fos = null;try {File file = outfile;fos = new FileOutputStream(file);byte[] buffer = new byte[1024];int len;while((len = is.read(buffer)) > 0){fos.write(buffer, 0, len);}} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e);} finally {try {is.close();fos.close();} catch (Exception e2) {e2.printStackTrace();throw new RuntimeException(e2);}}}/*** Read an input stream into a string* @param in* @return* @throws IOException*/static public String streamToString(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();}public static byte[] stream2Byte(InputStream is) throws IOException {ByteArrayOutputStream baos = new ByteArrayOutputStream();int len = 0;byte[] b = new byte[1024];while ((len = is.read(b, 0, b.length)) != -1) { baos.write(b, 0, len);}byte[] buffer = baos.toByteArray();return buffer;}/** * @方法功能 InputStream 转为 byte * @param InputStream * @return 字节数组 * @throws Exception */ public static byte[] inputStream2Byte(InputStream inStream) throws Exception { // ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); // byte[] buffer = new byte[1024]; // int len = -1; // while ((len = inStream.read(buffer)) != -1) { // outSteam.write(buffer, 0, len); // } // outSteam.close(); // inStream.close(); // return outSteam.toByteArray(); int count = 0; while (count == 0) { count = inStream.available(); } byte[] b = new byte[count]; inStream.read(b); return b; } /** * @方法功能 byte 转为 InputStream * @param 字节数组 * @return InputStream * @throws Exception */ public static InputStream byte2InputStream(byte[] b) throws Exception { InputStream is = new ByteArrayInputStream(b); return is; } /** * @功能 短整型与字节的转换 * @param 短整型 * @return 两位的字节数组 */ public static byte[] shortToByte(short number) { int temp = number; byte[] b = new byte[2]; for (int i = 0; i < b.length; i++) { b[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位 temp = temp >> 8; // 向右移8位 } return b; } /** * @功能 字节的转换与短整型 * @param 两位的字节数组 * @return 短整型 */ public static short byteToShort(byte[] b) { short s = 0; short s0 = (short) (b[0] & 0xff);// 最低位 short s1 = (short) (b[1] & 0xff); s1 <<= 8; s = (short) (s0 | s1); return s; } /** * @方法功能 整型与字节数组的转换 * @param 整型 * @return 四位的字节数组 */ public static byte[] intToByte(int i) { byte[] bt = new byte[4]; bt[0] = (byte) (0xff & i); bt[1] = (byte) ((0xff00 & i) >> 8); bt[2] = (byte) ((0xff0000 & i) >> 16); bt[3] = (byte) ((0xff000000 & i) >> 24); return bt; } /** * @方法功能 字节数组和整型的转换 * @param 字节数组 * @return 整型 * @author www.zuidaima.com*/ public static int bytesToInt(byte[] bytes) { int num = bytes[0] & 0xFF; num |= ((bytes[1] << 8) & 0xFF00); num |= ((bytes[2] << 16) & 0xFF0000); num |= ((bytes[3] << 24) & 0xFF000000); return num; } /** * @方法功能 字节数组和长整型的转换 * @param 字节数组 * @return 长整型 */ public static byte[] longToByte(long number) { long temp = number; byte[] b = new byte[8]; for (int i = 0; i < b.length; i++) { b[i] = new Long(temp & 0xff).byteValue(); // 将最低位保存在最低位 temp = temp >> 8; // 向右移8位 } return b; } /** * @方法功能 字节数组和长整型的转换 * @param 字节数组 * @return 长整型 */ public static long byteToLong(byte[] b) { long s = 0; long s0 = b[0] & 0xff;// 最低位 long s1 = b[1] & 0xff; long s2 = b[2] & 0xff; long s3 = b[3] & 0xff; long s4 = b[4] & 0xff;// 最低位 long s5 = b[5] & 0xff; long s6 = b[6] & 0xff; long s7 = b[7] & 0xff; // s0不变 s1 <<= 8; s2 <<= 16; s3 <<= 24; s4 <<= 8 * 4; s5 <<= 8 * 5; s6 <<= 8 * 6; s7 <<= 8 * 7; s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7; return s; }
}
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