Android获取手机中外置内存卡、内置内存卡、手机内存路径

2018-07-20    来源:open-open

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获取手机中外置内存卡、内置内存卡、手机内存路径。思路是:先用 Environment.getExternalStorageDirectory()获得外部存储卡路径(某些机型也表现为内部存储卡路径),如没有获 取到有效sd卡插入,则使用安卓的配置文件system/etc/vold.fstab读取全部挂载信息,假如也没有可写入的sd卡,则使用 getFilesDir()方式获得当前应用所在存储路径。为适应不同手机的内存情况,先分三种情况获得可存储路径phonePicsPath,后面代码较长是因为有两个工具类,复制即可,代码如下:


//首先判断是否有外部存储卡,如没有判断是否有内部存储卡,如没有,继续读取应用程序所在存储
		if(getExternalSdCardPath() != null){
			phonePicsPath = getExternalSdCardPath();
		}else{
			phonePicsPath = getFilesDir().getAbsolutePath();
		}


/**
     * 遍历 "system/etc/vold.fstab” 文件,获取全部的Android的挂载点信息
     * 
     * @return
     */
    private static ArrayList<String> getDevMountList() {
        String[] toSearch = FileUtils.readFile("/system/etc/vold.fstab").split(" ");
        ArrayList<String> out = new ArrayList<String>();
        for (int i = 0; i < toSearch.length; i++) {
            if (toSearch[i].contains("dev_mount")) {
                if (new File(toSearch[i + 2]).exists()) {
                    out.add(toSearch[i + 2]);
                }
            }
        }
        return out;
    }
/**
     * 获取扩展SD卡存储目录
     * 
     * 如果有外接的SD卡,并且已挂载,则返回这个外置SD卡目录
     * 否则:返回内置SD卡目录
     * 
     * @return
     */
    public static String getExternalSdCardPath() {
 
        if (SDCardUtils.isMounted()) {
            File sdCardFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
            return sdCardFile.getAbsolutePath();
        }
 
        String path = null;
 
        File sdCardFile = null;
 
        ArrayList<String> devMountList = getDevMountList();
 
        for (String devMount : devMountList) {
            File file = new File(devMount);
 
            if (file.isDirectory() && file.canWrite()) {
                path = file.getAbsolutePath();
 
                String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmmss").format(new Date());
                File testWritable = new File(path, "test_" + timeStamp);
 
                if (testWritable.mkdirs()) {
                    testWritable.delete();
                } else {
                    path = null;
                }
            }
        }
 
        if (path != null) {
            sdCardFile = new File(path);
            return sdCardFile.getAbsolutePath();
        }
 
        return null;
    }



FileUtils文件:



package com.zqsy.order.tools;

/***
 * 文件工具类
 * @author zhangda
 *
 */
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import android.text.TextUtils;

/**
 * File Utils
 * <ul>
 * Read or write file
 * <li>{@link #readFile(String)} read file</li>
 * <li>{@link #readFileToList(String)} read file to string list</li>
 * <li>{@link #writeFile(String, String, boolean)} write file from String</li>
 * <li>{@link #writeFile(String, String)} write file from String</li>
 * <li>{@link #writeFile(String, List, boolean)} write file from String List</li>
 * <li>{@link #writeFile(String, List)} write file from String List</li>
 * <li>{@link #writeFile(String, InputStream)} write file</li>
 * <li>{@link #writeFile(String, InputStream, boolean)} write file</li>
 * <li>{@link #writeFile(File, InputStream)} write file</li>
 * <li>{@link #writeFile(File, InputStream, boolean)} write file</li>
 * </ul>
 * <ul>
 * Operate file
 * <li>{@link #moveFile(File, File)} or {@link #moveFile(String, String)}</li>
 * <li>{@link #copyFile(String, String)}</li>
 * <li>{@link #getFileExtension(String)}</li>
 * <li>{@link #getFileName(String)}</li>
 * <li>{@link #getFileNameWithoutExtension(String)}</li>
 * <li>{@link #getFileSize(String)}</li>
 * <li>{@link #deleteFile(String)}</li>
 * <li>{@link #isFileExist(String)}</li>
 * <li>{@link #isFolderExist(String)}</li>
 * <li>{@link #makeFolders(String)}</li>
 * <li>{@link #makeDirs(String)}</li>
 * </ul>
 * 
 * @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> 2012-5-12
 */
public class FileUtils {

    public final static String FILE_EXTENSION_SEPARATOR = ".";

    private FileUtils() {
        throw new AssertionError();
    }

    /**
     * read file
     * 
     * @param filePath
     * @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws RuntimeException if an error occurs while operator BufferedReader
     */
    public static String readFile(String filePath) {
    	String fileContent = "";
        File file = new File(filePath);
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(new FileInputStream(file));
            reader = new BufferedReader(is);
            String line = null;
            int i = 0;
            while ((line = reader.readLine()) != null) {
                fileContent += line + " ";
            }
            reader.close();
            return fileContent;
        } catch (IOException e) {
        	e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                	e.printStackTrace();
                }
            }
        }
        return fileContent;
    }

    /**
     * write file
     * 
     * @param filePath
     * @param content
     * @param append is append, if true, write to the end of file, else clear content of file and write into it
     * @return return false if content is empty, true otherwise
     * @throws RuntimeException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, String content, boolean append) {
        if (StringUtils.isEmpty(content)) {
            return false;
        }

        FileWriter fileWriter = null;
        try {
            makeDirs(filePath);
            fileWriter = new FileWriter(filePath, append);
            fileWriter.write(content);
            fileWriter.close();
            return true;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (fileWriter != null) {
                try {
                    fileWriter.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * write file
     * 
     * @param filePath
     * @param contentList
     * @param append is append, if true, write to the end of file, else clear content of file and write into it
     * @return return false if contentList is empty, true otherwise
     * @throws RuntimeException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, List<String> contentList, boolean append) {
        if (contentList == null || contentList.size() == 0) {
            return false;
        }

        FileWriter fileWriter = null;
        try {
            makeDirs(filePath);
            fileWriter = new FileWriter(filePath, append);
            int i = 0;
            for (String line : contentList) {
                if (i++ > 0) {
                    fileWriter.write("\r\n");
                }
                fileWriter.write(line);
            }
            fileWriter.close();
            return true;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (fileWriter != null) {
                try {
                    fileWriter.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * write file, the string will be written to the begin of the file
     * 
     * @param filePath
     * @param content
     * @return
     */
    public static boolean writeFile(String filePath, String content) {
        return writeFile(filePath, content, false);
    }

    /**
     * write file, the string list will be written to the begin of the file
     * 
     * @param filePath
     * @param contentList
     * @return
     */
    public static boolean writeFile(String filePath, List<String> contentList) {
        return writeFile(filePath, contentList, false);
    }

    /**
     * write file, the bytes will be written to the begin of the file
     * 
     * @param filePath
     * @param stream
     * @return
     * @see {@link #writeFile(String, InputStream, boolean)}
     */
    public static boolean writeFile(String filePath, InputStream stream) {
        return writeFile(filePath, stream, false);
    }

    /**
     * write file
     * 
     * @param file the file to be opened for writing.
     * @param stream the input stream
     * @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning
     * @return return true
     * @throws RuntimeException if an error occurs while operator FileOutputStream
     */
    public static boolean writeFile(String filePath, InputStream stream, boolean append) {
        return writeFile(filePath != null ? new File(filePath) : null, stream, append);
    }

    /**
     * write file, the bytes will be written to the begin of the file
     * 
     * @param file
     * @param stream
     * @return
     * @see {@link #writeFile(File, InputStream, boolean)}
     */
    public static boolean writeFile(File file, InputStream stream) {
        return writeFile(file, stream, false);
    }

    /**
     * write file
     * 
     * @param file the file to be opened for writing.
     * @param stream the input stream
     * @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning
     * @return return true
     * @throws RuntimeException if an error occurs while operator FileOutputStream
     */
    public static boolean writeFile(File file, InputStream stream, boolean append) {
        OutputStream o = null;
        try {
            makeDirs(file.getAbsolutePath());
            o = new FileOutputStream(file, append);
            byte data[] = new byte[1024];
            int length = -1;
            while ((length = stream.read(data)) != -1) {
                o.write(data, 0, length);
            }
            o.flush();
            return true;
        } catch (FileNotFoundException e) {
            throw new RuntimeException("FileNotFoundException occurred. ", e);
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (o != null) {
                try {
                    o.close();
                    stream.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * move file
     * 
     * @param sourceFilePath
     * @param destFilePath
     */
    public static void moveFile(String sourceFilePath, String destFilePath) {
        if (TextUtils.isEmpty(sourceFilePath) || TextUtils.isEmpty(destFilePath)) {
            throw new RuntimeException("Both sourceFilePath and destFilePath cannot be null.");
        }
        moveFile(new File(sourceFilePath), new File(destFilePath));
    }

    /**
     * move file
     * 
     * @param srcFile
     * @param destFile
     */
    public static void moveFile(File srcFile, File destFile) {
        boolean rename = srcFile.renameTo(destFile);
        if (!rename) {
            copyFile(srcFile.getAbsolutePath(), destFile.getAbsolutePath());
            deleteFile(srcFile.getAbsolutePath());
        }
    }

    /**
     * copy file
     * 
     * @param sourceFilePath
     * @param destFilePath
     * @return
     * @throws RuntimeException if an error occurs while operator FileOutputStream
     */
    public static boolean copyFile(String sourceFilePath, String destFilePath) {
        InputStream inputStream = null;
        try {
            inputStream = new FileInputStream(sourceFilePath);
        } catch (FileNotFoundException e) {
            throw new RuntimeException("FileNotFoundException occurred. ", e);
        }
        return writeFile(destFilePath, inputStream);
    }

    /**
     * read file to string list, a element of list is a line
     * 
     * @param filePath
     * @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws RuntimeException if an error occurs while operator BufferedReader
     */
    public static List<String> readFileToList(String filePath, String charsetName) {
        File file = new File(filePath);
        List<String> fileContent = new ArrayList<String>();
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);
            reader = new BufferedReader(is);
            String line = null;
            while ((line = reader.readLine()) != null) {
                fileContent.add(line);
            }
            reader.close();
            return fileContent;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * get file name from path, not include suffix
     * 
     * <pre>
     *      getFileNameWithoutExtension(null)               =   null
     *      getFileNameWithoutExtension("")                 =   ""
     *      getFileNameWithoutExtension("   ")              =   "   "
     *      getFileNameWithoutExtension("abc")              =   "abc"
     *      getFileNameWithoutExtension("a.mp3")            =   "a"
     *      getFileNameWithoutExtension("a.b.rmvb")         =   "a.b"
     *      getFileNameWithoutExtension("c:\\")              =   ""
     *      getFileNameWithoutExtension("c:\\a")             =   "a"
     *      getFileNameWithoutExtension("c:\\a.b")           =   "a"
     *      getFileNameWithoutExtension("c:a.txt\\a")        =   "a"
     *      getFileNameWithoutExtension("/home/admin")      =   "admin"
     *      getFileNameWithoutExtension("/home/admin/a.txt/b.mp3")  =   "b"
     * </pre>
     * 
     * @param filePath
     * @return file name from path, not include suffix
     * @see
     */
    public static String getFileNameWithoutExtension(String filePath) {
        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (filePosi == -1) {
            return (extenPosi == -1 ? filePath : filePath.substring(0, extenPosi));
        }
        if (extenPosi == -1) {
            return filePath.substring(filePosi + 1);
        }
        return (filePosi < extenPosi ? filePath.substring(filePosi + 1, extenPosi) : filePath.substring(filePosi + 1));
    }

    /**
     * get file name from path, include suffix
     * 
     * <pre>
     *      getFileName(null)               =   null
     *      getFileName("")                 =   ""
     *      getFileName("   ")              =   "   "
     *      getFileName("a.mp3")            =   "a.mp3"
     *      getFileName("a.b.rmvb")         =   "a.b.rmvb"
     *      getFileName("abc")              =   "abc"
     *      getFileName("c:\\")              =   ""
     *      getFileName("c:\\a")             =   "a"
     *      getFileName("c:\\a.b")           =   "a.b"
     *      getFileName("c:a.txt\\a")        =   "a"
     *      getFileName("/home/admin")      =   "admin"
     *      getFileName("/home/admin/a.txt/b.mp3")  =   "b.mp3"
     * </pre>
     * 
     * @param filePath
     * @return file name from path, include suffix
     */
    public static String getFileName(String filePath) {
        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? filePath : filePath.substring(filePosi + 1);
    }

    /**
     * get folder name from path
     * 
     * <pre>
     *      getFolderName(null)               =   null
     *      getFolderName("")                 =   ""
     *      getFolderName("   ")              =   ""
     *      getFolderName("a.mp3")            =   ""
     *      getFolderName("a.b.rmvb")         =   ""
     *      getFolderName("abc")              =   ""
     *      getFolderName("c:\\")              =   "c:"
     *      getFolderName("c:\\a")             =   "c:"
     *      getFolderName("c:\\a.b")           =   "c:"
     *      getFolderName("c:a.txt\\a")        =   "c:a.txt"
     *      getFolderName("c:a\\b\\c\\d.txt")    =   "c:a\\b\\c"
     *      getFolderName("/home/admin")      =   "/home"
     *      getFolderName("/home/admin/a.txt/b.mp3")  =   "/home/admin/a.txt"
     * </pre>
     * 
     * @param filePath
     * @return
     */
    public static String getFolderName(String filePath) {

        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? "" : filePath.substring(0, filePosi);
    }

    /**
     * get suffix of file from path
     * 
     * <pre>
     *      getFileExtension(null)               =   ""
     *      getFileExtension("")                 =   ""
     *      getFileExtension("   ")              =   "   "
     *      getFileExtension("a.mp3")            =   "mp3"
     *      getFileExtension("a.b.rmvb")         =   "rmvb"
     *      getFileExtension("abc")              =   ""
     *      getFileExtension("c:\\")              =   ""
     *      getFileExtension("c:\\a")             =   ""
     *      getFileExtension("c:\\a.b")           =   "b"
     *      getFileExtension("c:a.txt\\a")        =   ""
     *      getFileExtension("/home/admin")      =   ""
     *      getFileExtension("/home/admin/a.txt/b")  =   ""
     *      getFileExtension("/home/admin/a.txt/b.mp3")  =   "mp3"
     * </pre>
     * 
     * @param filePath
     * @return
     */
    public static String getFileExtension(String filePath) {
        if (StringUtils.isBlank(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (extenPosi == -1) {
            return "";
        }
        return (filePosi >= extenPosi) ? "" : filePath.substring(extenPosi + 1);
    }

    /**
     * Creates the directory named by the trailing filename of this file, including the complete directory path required
     * to create this directory. <br/>
     * <br/>
     * <ul>
     * <strong>Attentions:</strong>
     * <li>makeDirs("C:\\Users\\Trinea") can only create users folder</li>
     * <li>makeFolder("C:\\Users\\Trinea\\") can create Trinea folder</li>
     * </ul>
     * 
     * @param filePath
     * @return true if the necessary directories have been created or the target directory already exists, false one of
     *         the directories can not be created.
     *         <ul>
     *         <li>if {@link FileUtils#getFolderName(String)} return null, return false</li>
     *         <li>if target directory already exists, return true</li>
     *         <li>return {@link java.io.File#makeFolder}</li>
     *         </ul>
     */
    public static boolean makeDirs(String filePath) {
        String folderName = getFolderName(filePath);
        if (StringUtils.isEmpty(folderName)) {
            return false;
        }

        File folder = new File(folderName);
        return (folder.exists() && folder.isDirectory()) ? true : folder.mkdirs();
    }

    /**
     * @param filePath
     * @return
     * @see #makeDirs(String)
     */
    public static boolean makeFolders(String filePath) {
        return makeDirs(filePath);
    }

    /**
     * Indicates if this file represents a file on the underlying file system.
     * 
     * @param filePath
     * @return
     */
    public static boolean isFileExist(String filePath) {
        if (StringUtils.isBlank(filePath)) {
            return false;
        }

        File file = new File(filePath);
        return (file.exists() && file.isFile());
    }

    /**
     * Indicates if this file represents a directory on the underlying file system.
     * 
     * @param directoryPath
     * @return
     */
    public static boolean isFolderExist(String directoryPath) {
        if (StringUtils.isBlank(directoryPath)) {
            return false;
        }

        File dire = new File(directoryPath);
        return (dire.exists() && dire.isDirectory());
    }

    /**
     * delete file or directory
     * <ul>
     * <li>if path is null or empty, return true</li>
     * <li>if path not exist, return true</li>
     * <li>if path exist, delete recursion. return true</li>
     * <ul>
     * 
     * @param path
     * @return
     */
    public static boolean deleteFile(String path) {
        if (StringUtils.isBlank(path)) {
            return true;
        }

        File file = new File(path);
        if (!file.exists()) {
            return true;
        }
        if (file.isFile()) {
            return file.delete();
        }
        if (!file.isDirectory()) {
            return false;
        }
        for (File f : file.listFiles()) {
            if (f.isFile()) {
                f.delete();
            } else if (f.isDirectory()) {
                deleteFile(f.getAbsolutePath());
            }
        }
        return file.delete();
    }

    /**
     * get file size
     * <ul>
     * <li>if path is null or empty, return -1</li>
     * <li>if path exist and it is a file, return file size, else return -1</li>
     * <ul>
     * 
     * @param path
     * @return returns the length of this file in bytes. returns -1 if the file does not exist.
     */
    public static long getFileSize(String path) {
        if (StringUtils.isBlank(path)) {
            return -1;
        }

        File file = new File(path);
        return (file.exists() && file.isFile() ? file.length() : -1);
    }
}



StringUtils文件



package com.zqsy.order.tools;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * String Utils
 * 
 * @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> 2011-7-22
 */
public class StringUtils {

    private StringUtils() {
        throw new AssertionError();
    }

    /**
     * is null or its length is 0 or it is made by space
     * 
     * <pre>
     * isBlank(null) = true;
     * isBlank(&quot;&quot;) = true;
     * isBlank(&quot;  &quot;) = true;
     * isBlank(&quot;a&quot;) = false;
     * isBlank(&quot;a &quot;) = false;
     * isBlank(&quot; a&quot;) = false;
     * isBlank(&quot;a b&quot;) = false;
     * </pre>
     * 
     * @param str
     * @return if string is null or its size is 0 or it is made by space, return true, else return false.
     */
    public static boolean isBlank(String str) {
        return (str == null || str.trim().length() == 0);
    }

    /**
     * is null or its length is 0
     * 
     * <pre>
     * isEmpty(null) = true;
     * isEmpty(&quot;&quot;) = true;
     * isEmpty(&quot;  &quot;) = false;
     * </pre>
     * 
     * @param str
     * @return if string is null or its size is 0, return true, else return false.
     */
    public static boolean isEmpty(CharSequence str) {
        return (str == null || str.length() == 0);
    }

    /**
     * compare two string
     * 
     * @param actual
     * @param expected
     * @return
     * @see ObjectUtils#isEquals(Object, Object)
     */
    public static boolean isEquals(String actual, String expected) {
    	return actual == expected || (actual == null ? expected == null : actual.equals(expected));
    }

    /**
     * get length of CharSequence
     * 
     * <pre>
     * length(null) = 0;
     * length(\"\") = 0;
     * length(\"abc\") = 3;
     * </pre>
     * 
     * @param str
     * @return if str is null or empty, return 0, else return {@link CharSequence#length()}.
     */
    public static int length(CharSequence str) {
        return str == null ? 0 : str.length();
    }

    /**
     * null Object to empty string
     * 
     * <pre>
     * nullStrToEmpty(null) = &quot;&quot;;
     * nullStrToEmpty(&quot;&quot;) = &quot;&quot;;
     * nullStrToEmpty(&quot;aa&quot;) = &quot;aa&quot;;
     * </pre>
     * 
     * @param str
     * @return
     */
    public static String nullStrToEmpty(Object str) {
        return (str == null ? "" : (str instanceof String ? (String)str : str.toString()));
    }

    /**
     * capitalize first letter
     * 
     * <pre>
     * capitalizeFirstLetter(null)     =   null;
     * capitalizeFirstLetter("")       =   "";
     * capitalizeFirstLetter("2ab")    =   "2ab"
     * capitalizeFirstLetter("a")      =   "A"
     * capitalizeFirstLetter("ab")     =   "Ab"
     * capitalizeFirstLetter("Abc")    =   "Abc"
     * </pre>
     * 
     * @param str
     * @return
     */
    public static String capitalizeFirstLetter(String str) {
        if (isEmpty(str)) {
            return str;
        }

        char c = str.charAt(0);
        return (!Character.isLetter(c) || Character.isUpperCase(c)) ? str : new StringBuilder(str.length())
                .append(Character.toUpperCase(c)).append(str.substring(1)).toString();
    }

    /**
     * encoded in utf-8
     * 
     * <pre>
     * utf8Encode(null)        =   null
     * utf8Encode("")          =   "";
     * utf8Encode("aa")        =   "aa";
     * utf8Encode("啊啊啊啊")   = "%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A";
     * </pre>
     * 
     * @param str
     * @return
     * @throws UnsupportedEncodingException if an error occurs
     */
    public static String utf8Encode(String str) {
        if (!isEmpty(str) && str.getBytes().length != str.length()) {
            try {
                return URLEncoder.encode(str, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException("UnsupportedEncodingException occurred. ", e);
            }
        }
        return str;
    }

    /**
     * encoded in utf-8, if exception, return defultReturn
     * 
     * @param str
     * @param defultReturn
     * @return
     */
    public static String utf8Encode(String str, String defultReturn) {
        if (!isEmpty(str) && str.getBytes().length != str.length()) {
            try {
                return URLEncoder.encode(str, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                return defultReturn;
            }
        }
        return str;
    }

    /**
     * get innerHtml from href
     * 
     * <pre>
     * getHrefInnerHtml(null)                                  = ""
     * getHrefInnerHtml("")                                    = ""
     * getHrefInnerHtml("mp3")                                 = "mp3";
     * getHrefInnerHtml("&lt;a innerHtml&lt;/a&gt;")                    = "&lt;a innerHtml&lt;/a&gt;";
     * getHrefInnerHtml("&lt;a&gt;innerHtml&lt;/a&gt;")                    = "innerHtml";
     * getHrefInnerHtml("&lt;a&lt;a&gt;innerHtml&lt;/a&gt;")                    = "innerHtml";
     * getHrefInnerHtml("&lt;a href="baidu.com"&gt;innerHtml&lt;/a&gt;")               = "innerHtml";
     * getHrefInnerHtml("&lt;a href="baidu.com" title="baidu"&gt;innerHtml&lt;/a&gt;") = "innerHtml";
     * getHrefInnerHtml("   &lt;a&gt;innerHtml&lt;/a&gt;  ")                           = "innerHtml";
     * getHrefInnerHtml("&lt;a&gt;innerHtml&lt;/a&gt;&lt;/a&gt;")                      = "innerHtml";
     * getHrefInnerHtml("jack&lt;a&gt;innerHtml&lt;/a&gt;&lt;/a&gt;")                  = "innerHtml";
     * getHrefInnerHtml("&lt;a&gt;innerHtml1&lt;/a&gt;&lt;a&gt;innerHtml2&lt;/a&gt;")        = "innerHtml2";
     * </pre>
     * 
     * @param href
     * @return <ul>
     *         <li>if href is null, return ""</li>
     *         <li>if not match regx, return source</li>
     *         <li>return the last string that match regx</li>
     *         </ul>
     */
    public static String getHrefInnerHtml(String href) {
        if (isEmpty(href)) {
            return "";
        }

        String hrefReg = ".*<[\\s]*a[\\s]*.*>(.+?)<[\\s]*/a[\\s]*>.*";
        Pattern hrefPattern = Pattern.compile(hrefReg, Pattern.CASE_INSENSITIVE);
        Matcher hrefMatcher = hrefPattern.matcher(href);
        if (hrefMatcher.matches()) {
            return hrefMatcher.group(1);
        }
        return href;
    }

/**
     * process special char in html
     * 
     * <pre>
     * htmlEscapeCharsToString(null) = null;
     * htmlEscapeCharsToString("") = "";
     * htmlEscapeCharsToString("mp3") = "mp3";
     * htmlEscapeCharsToString("mp3&lt;") = "mp3<";
     * htmlEscapeCharsToString("mp3&gt;") = "mp3\>";
     * htmlEscapeCharsToString("mp3&amp;mp4") = "mp3&mp4";
     * htmlEscapeCharsToString("mp3&quot;mp4") = "mp3\"mp4";
     * htmlEscapeCharsToString("mp3&lt;&gt;&amp;&quot;mp4") = "mp3\<\>&\"mp4";
     * </pre>
     * 
     * @param source
     * @return
     */
    public static String htmlEscapeCharsToString(String source) {
        return StringUtils.isEmpty(source) ? source : source.replaceAll("&lt;", "<").replaceAll("&gt;", ">")
                .replaceAll("&amp;", "&").replaceAll("&quot;", "\"");
    }

    /**
     * transform half width char to full width char
     * 
     * <pre>
     * fullWidthToHalfWidth(null) = null;
     * fullWidthToHalfWidth("") = "";
     * fullWidthToHalfWidth(new String(new char[] {12288})) = " ";
     * fullWidthToHalfWidth("!"#$%&) = "!\"#$%&";
     * </pre>
     * 
     * @param s
     * @return
     */
    public static String fullWidthToHalfWidth(String s) {
        if (isEmpty(s)) {
            return s;
        }

        char[] source = s.toCharArray();
        for (int i = 0; i < source.length; i++) {
            if (source[i] == 12288) {
                source[i] = ' ';
                // } else if (source[i] == 12290) {
                // source[i] = '.';
            } else if (source[i] >= 65281 && source[i] <= 65374) {
                source[i] = (char)(source[i] - 65248);
            } else {
                source[i] = source[i];
            }
        }
        return new String(source);
    }

    /**
     * transform full width char to half width char
     * 
     * <pre>
     * halfWidthToFullWidth(null) = null;
     * halfWidthToFullWidth("") = "";
     * halfWidthToFullWidth(" ") = new String(new char[] {12288});
     * halfWidthToFullWidth("!\"#$%&) = "!"#$%&";
     * </pre>
     * 
     * @param s
     * @return
     */
    public static String halfWidthToFullWidth(String s) {
        if (isEmpty(s)) {
            return s;
        }

        char[] source = s.toCharArray();
        for (int i = 0; i < source.length; i++) {
            if (source[i] == ' ') {
                source[i] = (char)12288;
                // } else if (source[i] == '.') {
                // source[i] = (char)12290;
            } else if (source[i] >= 33 && source[i] <= 126) {
                source[i] = (char)(source[i] + 65248);
            } else {
                source[i] = source[i];
            }
        }
        return new String(source);
    }
}



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