每天多一点之字符流、java压缩文件

 

package com.demo.zip;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

/**
 * 
 * @Description 测试zip压缩
 * @author HackerD
 * @version 1.0
 * @CreateAt 2013-5-22 下午4:11:09
 */
public class TestZipFile {
    private int[] no = { 1, 3, 4, 5, 7, 9, 12 };
    private double[] scores = { 77.4, 67.5, 88.3, 78.8, 98.5, 78.4, 76.4 };

    /**
     * 
     * @Description 将人数学号成绩按照格式：人数-学号1;学号2...-成绩1;成绩2... 写入文本文件
     * @author HackerD   
     * @CreateAt   2013-5-22 下午7:40:49  
     * @version V1.0   
     * @ModificationHistory<BR>   
     * Date         Author       Version      Description <BR>
     * ----------------------------------------------
     *
     */
    public void writeData() {
        FileWriter fw = null;
        BufferedWriter bfw = null;
        try {
            fw = new FileWriter("Score.txt");
            bfw = new BufferedWriter(fw);
            String noStr = "";
            String scoreStr = "";
            // 拼凑学号跟成绩
            for (int i = 0; i < no.length; i++) {
                noStr += no[i] + ";";
                scoreStr += scores[i] + ";";
            }
            // 写入文件
            bfw.write(no.length + "-" + noStr.substring(0, noStr.length() - 1)
                    + "-" + scoreStr.substring(0, scoreStr.length() - 1));
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                bfw.close();
                fw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 
     * @Description 根据写入的格式从Score.txt中找出最高成绩和对应学号
     * @author HackerD   
     * @CreateAt   2013-5-22 下午7:41:01  
     * @version V1.0   
     * @ModificationHistory<BR>   
     * Date         Author       Version      Description <BR>
     * ----------------------------------------------
     *
     */
    public void findMaxScore() {
        FileReader fr = null;
        BufferedReader bfr = null;
        String info = "";
        String temp = "";
        double maxScore = 0;
        int pos = 0;
        try {
            fr = new FileReader("Score.txt");
            bfr = new BufferedReader(fr);

            // 读取信息存放在info中
            while ((temp = bfr.readLine()) != null) {
                info += temp;
            }

            // 拆分信息
            String[] infoarr = info.split("-");
            // 拆分出成绩
            String[] scores = infoarr[2].split(";");
            // 拆分出学号
            String[] no = infoarr[1].split(";");

            // 找出最高成绩
            for (int i = 0; i < scores.length; i++) {
                if (Double.parseDouble(scores[i]) > maxScore) {
                    maxScore = Double.parseDouble(scores[i]);
                    pos = i;
                }
            }
            // 打印结果
            System.out.println("最高成绩为:" + maxScore + ";学号为:" + no[pos]);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                bfr.close();
                fr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 
     * @Description 将Score.txt压缩Score.zip
     * @author HackerD   
     * @CreateAt   2013-5-22 下午7:41:13  
     * @version V1.0   
     * @ModificationHistory<BR>   
     * Date         Author       Version      Description <BR>
     * ----------------------------------------------
     *
     */
    public void scoreZip() {
        try {
            InputStream is = new FileInputStream("Score.txt");
            OutputStream os = new FileOutputStream("Score.zip");
            ZipOutputStream zf = new ZipOutputStream(os);
            // 添加条目
            zf.putNextEntry(new ZipEntry("Score.txt"));

            int n = 0;
            // 写入压缩包
            while ((n = is.read()) != -1) {
                zf.write(n);
            }

            zf.close();
            os.close();
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 
     * @Description 将Socre.zip解压到test文件夹里
     * @author HackerD   
     * @CreateAt   2013-5-22 下午7:41:25  
     * @version V1.0   
     * @ModificationHistory<BR>   
     * Date         Author       Version      Description <BR>
     * ----------------------------------------------
     *
     */
    public void scoreUnzip() {
        try {
            ZipFile zf = new ZipFile("Score.zip");
            // 返回指定 ZIP 文件条目。
            ZipEntry zEntry = zf.getEntry("Score.txt");
            // 返回输入流以读取指定 ZIP 文件条目的内容。
            InputStream is = zf.getInputStream(zEntry);
            OutputStream os = new FileOutputStream("test/Score.txt");
            int n = 0;
            // 解压
            while ((n = is.read()) != -1) {
                os.write(n);
            }

            os.close();
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        TestZipFile testZipFile = new TestZipFile();
        testZipFile.writeData();
        testZipFile.findMaxScore();
        testZipFile.scoreZip();
        testZipFile.scoreUnzip();
    }

}