[文件] IO常用工具类IOUtils（Java读文件，写文件，打Zip包）http://www.bieryun.com/1003.html
功能目录：
- 将输入流转换成字节流
- 将文件读取为一个字符串
- 以指定编码格式将输入流按行置入一个列表<字符串>
- 以GBK格式将输入流按行置入一个列表<字符串>
- 转换为每行补充指定换行符（例如： “\ n”， “</ BR>”）
- 将字符串转出到指定文件
- 将多个文件打成一个拉链包
源码：
- 包 amosryan.utility.file;
- import java.io.BufferedReader;
- import java.io.ByteArrayOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
- import java.io.FileWriter;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.PrintWriter;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.zip.ZipEntry;
- import java.util.zip.ZipOutputStream;
- /**
- * IO常用工具包
- * @author amosryan
- * @since 2010-06-03
- */
- public class IOUtils {
- /**
- * 将输入流转换成字节流
- * @param input
- * @return
- * @throws Exception
- */
- public static byte[] toBytes(InputStream input) throws Exception {
- byte[] data = null;
- try {
- ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
- byte[] b = new byte[1024];
- int read = 0;
- while ((read = input.read(b)) > 0) {
- byteOut.write(b, 0, read);
- }
- data = byteOut.toByteArray();
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- input.close();
- }
- return data;
- }
- /**
- * 将文件读取为一个字符串
- *
- * @param input
- * @return
- * @throws Exception
- */
- public static String toString(File file) throws Exception {
- return toString(new FileInputStream(file));
- }
- /**
- * 将输入流转换为一个串
- *
- * @param input
- * @return
- * @throws Exception
- */
- public static String toString(InputStream input) throws Exception {
- return toStringWithLineBreak(input, null);
- }
- /**
- * 以指定编码格式将输入流按行置入一个List<String>
- *
- * @param input
- * @return
- * @throws Exception
- */
- public static List<String> toLines(InputStream input, String encoding)
- throws Exception {
- InputStreamReader insreader = new InputStreamReader(input, encoding);
- BufferedReader bin = new BufferedReader(insreader);
- List<String> lines = new ArrayList<String>();
- String line;
- while ((line = bin.readLine()) != null) {
- lines.add(line);
- }
- bin.close();
- insreader.close();
- return lines;
- }
- /**
- * 以GBK格式将输入流按行置入一个List<String>
- *
- * @param input
- * @return
- * @throws Exception
- */
- public static List<String> toLines(InputStream input) throws Exception {
- return toLines(input, "GBK");
- }
- /**
- * 转换为每行补充指定换行符(例如："/n"，"</br>")
- *
- * @param input
- * @param lineBreak
- * @return
- * @throws Exception
- */
- public static String toStringWithLineBreak(InputStream input,
- String lineBreak) throws Exception {
- List<String> lines = toLines(input);
- StringBuilder sb = new StringBuilder(20480);
- for (String line : lines) {
- sb.append(line);
- if (lineBreak != null) {
- sb.append(lineBreak);
- }
- }
- return sb.toString();
- }
- /**
- * 将字符串转出到指定文件
- * @param saveFile
- * @param content
- */
- public static void toFile(File saveFile, String content) {
- File parent = saveFile.getParentFile();
- if (!parent.exists()) {
- parent.mkdirs();
- }
- PrintWriter out = null;
- try {
- out = new PrintWriter(new FileWriter(saveFile));
- out.print(content);
- out.flush();
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- if (out != null) {
- out.close();
- }
- }
- }
- /**
- * 将一组文件打zip包
- *
- * @param srcFiles
- * @param targetFileName
- * @throws IOException
- */
- public static void filesToZip(List<File> srcFiles, String targetFileName)
- throws IOException {
- String fileOutName = targetFileName + ".zip";
- byte[] buf = new byte[1024];
- FileInputStream in = null;
- FileOutputStream fos = null;
- ZipOutputStream out = null;
- try {
- fos = new FileOutputStream(fileOutName);
- out = new ZipOutputStream(fos);
- for (File file : srcFiles) {
- in = new FileInputStream(file);
- out.putNextEntry(new ZipEntry(file.getName()));
- int len;
- while ((len = in.read(buf)) != -1) {
- out.write(buf, 0, len);
- }
- if (in != null) {
- in.close();
- }
- }
- } 捕获 （例外五）{
- e.printStackTrace（）;
- } 最后 {
- if （in！= null）{
- 附寄（）;
- }
- if （fos！= null）{
- out.closeEntry（）;
- out.close（）;
- fos.close（）;
- }
- }
- }
- public static void main（String [] args）{
- 尝试 {
- 文件doc1 = 新 文件（
- “E：//workspace//test//doc//1272531757100_1.doc”）;
- IOUtils.toString（new FileInputStream（doc1））;
- } 捕获 （例外五）{
- e.printStackTrace（）;
- }
- }
- }
