今天项目提了一个新需求：把html网页放在本地，如果后台修改了网页，手机端要去后台下载压缩包并解压后把本地的网页跟新成最新的，请求后台接口，根据返回的结果中的某个字段判断是否需要下载zip文件，如果需要下载，返回的结果中会提供zip文件下载的地址，下载后并解压显示网页，既然需求提了就得去实现

先来看下实现的效果图：

文件下载

解压后显示本地HTML：

1.实现文件的下载

文件下载可以参考这篇博客：https://blog.csdn.net/yushuangping/article/details/84038582

2.文件解压缩的工具类：

/**
 * Created by YuShuangPing on 2018/11/11.
 */
public class ZipUtils {
    public static final String TAG = "ZIP";

    public ZipUtils() {

    }

    /**
     * 解压zip到指定的路径
     *
     * @param zipFileString ZIP的名称
     * @param outPathString 要解压缩路径
     * @throws Exception
     */
    public static void UnZipFolder(String zipFileString, String outPathString) throws Exception {
        ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
        ZipEntry zipEntry;
        String szName = "";
        while ((zipEntry = inZip.getNextEntry()) != null) {
            szName = zipEntry.getName();
            if (zipEntry.isDirectory()) {
                //获取部件的文件夹名
                szName = szName.substring(0, szName.length() - 1);
                File folder = new File(outPathString + File.separator + szName);
                folder.mkdirs();
            } else {
                Log.e(TAG, outPathString + File.separator + szName);
                File file = new File(outPathString + File.separator + szName);
                if (!file.exists()) {
                    Log.e(TAG, "Create the file:" + outPathString + File.separator + szName);
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }
                // 获取文件的输出流
                FileOutputStream out = new FileOutputStream(file);
                int len;
                byte[] buffer = new byte[1024];
                // 读取（字节）字节到缓冲区
                while ((len = inZip.read(buffer)) != -1) {
                    // 从缓冲区（0）位置写入（字节）字节
                    out.write(buffer, 0, len);
                    out.flush();
                }
                out.close();
            }
        }
        inZip.close();
    }

    public static void UnZipFolder(String zipFileString, String outPathString, String szName) throws Exception {
        ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
        ZipEntry zipEntry;
        while ((zipEntry = inZip.getNextEntry()) != null) {
            //szName = zipEntry.getName();
            if (zipEntry.isDirectory()) {
                //获取部件的文件夹名
                szName = szName.substring(0, szName.length() - 1);
                File folder = new File(outPathString + File.separator + szName);
                folder.mkdirs();
            } else {
                Log.e(TAG, outPathString + File.separator + szName);
                File file = new File(outPathString + File.separator + szName);
                if (!file.exists()) {
                    Log.e(TAG, "Create the file:" + outPathString + File.separator + szName);
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }
                // 获取文件的输出流
                FileOutputStream out = new FileOutputStream(file);
                int len;
                byte[] buffer = new byte[1024];
                // 读取（字节）字节到缓冲区
                while ((len = inZip.read(buffer)) != -1) {
                    // 从缓冲区（0）位置写入（字节）字节
                    out.write(buffer, 0, len);
                    out.flush();
                }
                out.close();
            }
        }
        inZip.close();
    }

    /**
     * 压缩文件和文件夹
     *
     * @param srcFileString 要压缩的文件或文件夹
     * @param zipFileString 解压完成的Zip路径
     * @throws Exception
     */
    public static void ZipFolder(String srcFileString, String zipFileString) throws Exception {
        //创建ZIP
        ZipOutputStream outZip = new ZipOutputStream(new FileOutputStream(zipFileString));
        //创建文件
        File file = new File(srcFileString);
        //压缩
        LogUtils.LOGE("---->"+file.getParent()+"==="+file.getAbsolutePath());
        ZipFiles(file.getParent()+ File.separator, file.getName(), outZip);
        //完成和关闭
        outZip.finish();
        outZip.close();
    }

    /**
     * 压缩文件
     *
     * @param folderString
     * @param fileString
     * @param zipOutputSteam
     * @throws Exception
     */
    private static void ZipFiles(String folderString, String fileString, ZipOutputStream zipOutputSteam) throws Exception {
        LogUtils.LOGE("folderString:" + folderString + "\n" +
                "fileString:" + fileString + "\n==========================");
        if (zipOutputSteam == null)
            return;
        File file = new File(folderString + fileString);
        if (file.isFile()) {
            ZipEntry zipEntry = new ZipEntry(fileString);
            FileInputStream inputStream = new FileInputStream(file);
            zipOutputSteam.putNextEntry(zipEntry);
            int len;
            byte[] buffer = new byte[4096];
            while ((len = inputStream.read(buffer)) != -1) {
                zipOutputSteam.write(buffer, 0, len);
            }
            zipOutputSteam.closeEntry();
        } else {
            //文件夹
            String fileList[] = file.list();
            //没有子文件和压缩
            if (fileList.length <= 0) {
                ZipEntry zipEntry = new ZipEntry(fileString + File.separator);
                zipOutputSteam.putNextEntry(zipEntry);
                zipOutputSteam.closeEntry();
            }
            //子文件和递归
            for (int i = 0; i < fileList.length; i++) {
                ZipFiles(folderString+fileString+"/",  fileList[i], zipOutputSteam);
            }
        }
    }

    /**
     * 返回zip的文件输入流
     *
     * @param zipFileString zip的名称
     * @param fileString    ZIP的文件名
     * @return InputStream
     * @throws Exception
     */
    public static InputStream UpZip(String zipFileString, String fileString) throws Exception {
        ZipFile zipFile = new ZipFile(zipFileString);
        ZipEntry zipEntry = zipFile.getEntry(fileString);
        return zipFile.getInputStream(zipEntry);
    }

    /**
     * 返回ZIP中的文件列表（文件和文件夹）
     *
     * @param zipFileString  ZIP的名称
     * @param bContainFolder 是否包含文件夹
     * @param bContainFile   是否包含文件
     * @return
     * @throws Exception
     */
    public static List<File> GetFileList(String zipFileString, boolean bContainFolder, boolean bContainFile) throws Exception {
        List<File> fileList = new ArrayList<File>();
        ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
        ZipEntry zipEntry;
        String szName = "";
        while ((zipEntry = inZip.getNextEntry()) != null) {
            szName = zipEntry.getName();
            if (zipEntry.isDirectory()) {
                // 获取部件的文件夹名
                szName = szName.substring(0, szName.length() - 1);
                File folder = new File(szName);
                if (bContainFolder) {
                    fileList.add(folder);
                }
            } else {
                File file = new File(szName);
                if (bContainFile) {
                    fileList.add(file);
                }
            }
        }
        inZip.close();
        return fileList;
    }
}

3.activity中实现下载解压显示html页面

public class MainActivity extends BaseActivity implements LoginContract.View {
..........
private String savePath = FileUtils.getFileDir() + "thinkyun" + File.separator + "download.zip";//下载文件的存储绝对路径
    private String unZipPath = FileUtils.getFileDir() + "thinkyun" + File.separator + "download";//解压的zip文件路径
..........

 //请求网络成功的返回
    @Override
    public void onLoginSuccess(LoginUserBean2 bean) {
        int update = bean.getUpdate();
        //zip压缩包的下载地址
        downloadUrl = bean.getZipurl();
        if (update == 1) {//需要下载新的压缩包
            File file = new File(savePath);
            if (file.exists()) {
                file.delete();
            }
            //开始下载ZIP压缩包
            FileDownloadUtils.getInstance().startDownLoadFileSingle(downloadUrl, savePath,
                    new FileDownloadUtils.FileDownLoaderCallBack() {
                        @Override
                        public void downLoadCompleted(BaseDownloadTask task) {
                            LogUtils.LOGD("下载完成========");
                            try {
                                //解压ZIP压缩包
                                ZipUtils.UnZipFolder(savePath, unZipPath);
                                File file = new File(unZipPath + "/view/homepage/homepage.html");
                                if (file.exists()) {
                                    tv_progress.setVisibility(View.GONE);
                                    //显示html网页
                                    webView.loadUrl("file:" + unZipPath + "/view/homepage/homepage.html");
                                }
                            } catch (Exception e) {
                                e.printStackTrace();
                            }

                        }

                        @Override
                        public void downLoadError(BaseDownloadTask task, Throwable e) {

                        }

                        @Override
                        public void downLoadProgress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                            tv_progress.setText("下载进度：" + soFarBytes + "/" + totalBytes);
                        }
                    });
        }


    }

..........

}

到此就完成了上述功能

我是存储在getFileDir()路径下即：/data/data/包名/files下，在AndroidStudio中可以查看到：