Android下保存简单网页到本地(包括简单图片链接转换)

        最近在做一个项目涉及到将包含图片的简单网页下载到本地，方便离线时观看，在这里分享一下，大家做下简单修改就可以用到自己的项目中了。（这里用到了AQuery库）

  

package com.nekocode.xuedao.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.androidquery.AQuery;
import com.androidquery.callback.AjaxCallback;
import com.androidquery.callback.AjaxStatus;
import com.nekocode.xuedao.PublicData;
import com.nekocode.xuedao.PublicData.Subscribe;

public class HtmlStorageHelper {
	private String URL = "http://eduproject.sinaapp.com/fetchurl.php/getcontent/";
	private PublicData pd;
	private AQuery aq;
	private SQLiteDatabase mDB;
	private String mDownloadPath;
	
	public HtmlStorageHelper(Context context) {
		pd = PublicData.getInstance();
		aq = new AQuery(context);
		mDB = context.openOrCreateDatabase("data.db", Context.MODE_PRIVATE, null);
		mDB.execSQL("create table if not exists download_html(_id INTEGER PRIMARY KEY AUTOINCREMENT, content_id TEXT NOT NULL, title TEXT NOT NULL)");
		
		mDownloadPath = pd.mAppPath + "download/";
		File dir_file = new File(pd.mAppPath + "download/");
		if(!dir_file.exists())
			dir_file.mkdir();
	}
	
	public void saveHtml(final String id, final String title) {
		if(isHtmlSaved(id))
			return;
		
		aq.ajax(URL+id, String.class, new AjaxCallback<String>() {
			@Override
			public void callback(String url, String html, AjaxStatus status) {
				File dir_file = new File(mDownloadPath + id);
				if(!dir_file.exists())
					dir_file.mkdir();
				
				Pattern pattern = Pattern.compile("(?<=src=\")[^\"]+(?=\")");
				Matcher matcher = pattern.matcher(html);
				StringBuffer sb = new StringBuffer(); 
				while(matcher.find()){
					downloadPic(id, matcher.group(0));
					matcher.appendReplacement(sb, formatPath(matcher.group(0))); 
				}
				matcher.appendTail(sb);
				html = sb.toString();
				
				writeHtml(id, title, html);
			}
		});
	}
	
	private void downloadPic(String id, String url) {
		File pic_file = new File(mDownloadPath + id + "/" + formatPath(url));
		aq.download(url, pic_file, new AjaxCallback<File>() {
			@Override
			public void callback(String url, final File file, AjaxStatus status) {
			}
		});
	}
	
	private void writeHtml(String id, String title, String html) {
		File html_file = new File(mDownloadPath + id + "/index.html");
		FileOutputStream fos = null;
		try {
			fos=new FileOutputStream(html_file);
            fos.write(html.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                fos.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
		
		ContentValues values = new ContentValues();
		values.put("content_id", id);
		values.put("title", title);
		mDB.insert("download_html", "_id", values);
	}
	
	public boolean isHtmlSaved(String id) {
		File file = new File(mDownloadPath + id);
		if(file.exists()) {
			file = new File(mDownloadPath + id + "/index.html");
			if(file.exists())
				return true;
		}
		deleteHtml(id);
		return false;
	}
	
	public String getTitle(String id) {
		Cursor c = mDB.rawQuery("select * from download_html where content_id=?", new String[]{id});
		if(c.getCount() == 0)
			return null;
		
		c.moveToFirst();
		int index1 = c.getColumnIndex("title");
		
		return c.getString(index1);
	}
	
	public ArrayList<Subscribe> getHtmlList() {
		Cursor c = mDB.rawQuery("select * from download_html", null);
		ArrayList<Subscribe> list = new ArrayList<Subscribe>();
		if(c.getCount() != 0) {
			c.moveToFirst();
			int index1 = c.getColumnIndex("content_id");
			int index2 = c.getColumnIndex("title");
			
			while (!c.isAfterLast()) {
				String id = c.getString(index1);
				if(isHtmlSaved(id)) {
					Subscribe sub = new Subscribe(
							id,
							c.getString(index2),
							Subscribe.FILE_DOWNLOADED
							);
					list.add(sub);
				}
				
				c.moveToNext();
			}
		}
		
		return list;
	}
	
	public void deleteHtml(String id) {
		mDB.delete("download_html", "content_id=?", new String[]{id});
		File dir_file = new File(mDownloadPath + id);
		deleteFile(dir_file);
	}

	private void deleteFile(File file) {
		if (file.exists()) { // 判断文件是否存在
			if (file.isFile()) { // 判断是否是文件
				file.delete(); // delete()方法 你应该知道 是删除的意思;
			} else if (file.isDirectory()) { // 否则如果它是一个目录
				File files[] = file.listFiles(); // 声明目录下所有的文件 files[];
				for (int i = 0; i < files.length; i++) { // 遍历目录下所有的文件
					this.deleteFile(files[i]); // 把每个文件 用这个方法进行迭代
				}
			}
			file.delete();
		} else {
			//
		}
	}
	
	private String formatPath(String path) {
        if (path != null && path.length() > 0) {
            path = path.replace("\\", "_");
            path = path.replace("/", "_");
            path = path.replace(":", "_");
            path = path.replace("*", "_");
            path = path.replace("?", "_");
            path = path.replace("\"", "_");
            path = path.replace("<", "_");
            path = path.replace("|", "_");
            path = path.replace(">", "_");
        }
        return path;
    }
}