JAVA IO之ZipOutputString&ZipInputStream

文件压缩 ZipOutputStream类
--------------------------

先举一个压缩单个文件的例子吧：

import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipOutputStream;
     
    public class ZipOutputStreamDemo1{
        public static void main(String[] args) throws IOException{
            File file = new File("d:" + File.separator + "hello.txt");
            File zipFile = new File("d:" + File.separator + "hello.zip");
            InputStream input = new FileInputStream(file);
            ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(
                    zipFile));
            zipOut.putNextEntry(new ZipEntry(file.getName()));
            // 设置注释
            zipOut.setComment("hello");
            int temp = 0;
            while((temp = input.read()) != -1){
                zipOut.write(temp);
            }
            input.close();
            zipOut.close();
        }
    }

下面的们来看看如何压缩多个文件。

import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipOutputStream;
     
    /**
     * 一次性压缩多个文件
     * */
    public class ZipOutputStreamDemo2{
        public static void main(String[] args) throws IOException{
            // 要被压缩的文件夹
            File file = new File("d:" + File.separator + "temp");
            File zipFile = new File("d:" + File.separator + "zipFile.zip");
            InputStream input = null;
            ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(
                    zipFile));
            zipOut.setComment("hello");
            if(file.isDirectory()){
                File[] files = file.listFiles();
                for(int i = 0; i < files.length; ++i){
                    input = new FileInputStream(files[i]);
                    zipOut.putNextEntry(new ZipEntry(file.getName()
                            + File.separator + files[i].getName()));
                    int temp = 0;
                    while((temp = input.read()) != -1){
                        zipOut.write(temp);
                    }
                    input.close();
                }
            }
            zipOut.close();
        }
    }

解压ZipFile类
-------------

java中的每一个压缩文件都是可以使用ZipFile来进行表示的

import java.io.File;
    import java.io.IOException;
    import java.util.zip.ZipFile;
     
    /**
     * ZipFile演示
     * */
    public class ZipFileDemo{
        public static void main(String[] args) throws IOException{
            File file = new File("d:" + File.separator + "hello.zip");
            ZipFile zipFile = new ZipFile(file);
            System.out.println("压缩文件的名称为：" + zipFile.getName());
        }
    }

解压单个压缩文件

import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipFile;
     
    /**
     * 解压缩文件（压缩文件中只有一个文件的情况）
     * */
    public class ZipFileDemo2{
        public static void main(String[] args) throws IOException{
            File file = new File("d:" + File.separator + "hello.zip");
            File outFile = new File("d:" + File.separator + "unZipFile.txt");
            ZipFile zipFile = new ZipFile(file);
            ZipEntry entry = zipFile.getEntry("hello.txt");
            InputStream input = zipFile.getInputStream(entry);
            OutputStream output = new FileOutputStream(outFile);
            int temp = 0;
            while((temp = input.read()) != -1){
                output.write(temp);
            }
            input.close();
            output.close();
        }
    }

解压多个文件ZipInputStream类
----------------------------

当我们需要解压缩多个文件的时候，ZipEntry就无法使用了，如果想操作更加复杂的压缩文件，我们就必须使用ZipInputStream类

import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    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.ZipInputStream;
     
    /**
     * 解压缩一个压缩文件中包含多个文件的情况
     * */
    public class ZipFileDemo3{
        public static void main(String[] args) throws IOException{
            File file = new File("d:" + File.separator + "zipFile.zip");
            File outFile = null;
            ZipFile zipFile = new ZipFile(file);
            ZipInputStream zipInput = new ZipInputStream(new FileInputStream(file));
            ZipEntry entry = null;
            InputStream input = null;
            OutputStream output = null;
            while((entry = zipInput.getNextEntry()) != null){
                System.out.println("解压缩" + entry.getName() + "文件");
                outFile = new File("d:" + File.separator + entry.getName());
                if(!outFile.getParentFile().exists()){
                    outFile.getParentFile().mkdir();
                }
                if(!outFile.exists()){
                    outFile.createNewFile();
                }
                input = zipFile.getInputStream(entry);
                output = new FileOutputStream(outFile);
                int temp = 0;
                while((temp = input.read()) != -1){
                    output.write(temp);
                }
                input.close();
                output.close();
            }
        }
    }

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JAVA IO之ZipOutputString&ZipInputStream