//1、 克隆對(duì)象 
  // 新創(chuàng)建一個(gè)普通Java Bean，用來作為被克隆的對(duì)象 
   
    public class Person { 
    private String name = ""; 
    private String email = ""; 
   
    private int age; 
    //省略 set,get方法 
    } 
   
  // 再創(chuàng)建一個(gè)Test類，其中在main方法中代碼如下： 
    import java.lang.reflect.InvocationTargetException; 
    import java.util.HashMap; 
    import java.util.Map; 
    import org.apache.commons.beanutils.BeanUtils; 
    import org.apache.commons.beanutils.ConvertUtils; 
    public class Test { 
   
    /** 
   
    * @param args 
   
    */ 
    public static void main(String[] args) { 
    Person person = new Person(); 
    person.setName("tom"); 
    person.setAge(21); 
    try { 
        //克隆 
      Person person2 = (Person)BeanUtils.cloneBean(person); 
      System.out.println(person2.getName()+">>"+person2.getAge()); 
    } catch (IllegalAccessException e) { 
      e.printStackTrace(); 
    } catch (InstantiationException e) { 
      e.printStackTrace(); 
    } catch (InvocationTargetException e) { 
      e.printStackTrace(); 
    } catch (NoSuchMethodException e) { 
      e.printStackTrace(); 
   
    } 
   
    } 
   
    } 
   
  // 原理也是通過Java的反射機(jī)制來做的。 
  // 2、 將一個(gè)Map對(duì)象轉(zhuǎn)化為一個(gè)Bean 
  // 這個(gè)Map對(duì)象的key必須與Bean的屬性相對(duì)應(yīng)。 
    Map map = new HashMap(); 
    map.put("name","tom"); 
    map.put("email","tom@"); 
    map.put("age","21"); 
    //將map轉(zhuǎn)化為一個(gè)Person對(duì)象 
    Person person = new Person(); 
    BeanUtils.populate(person,map); 
  // 通過上面的一行代碼，此時(shí)person的屬性就已經(jīng)具有了上面所賦的值了。 
  // 將一個(gè)Bean轉(zhuǎn)化為一個(gè)Map對(duì)象了，如下： 
    Map map = BeanUtils.describe(person)

//1、 將JavaBean轉(zhuǎn)為XML內(nèi)容 
    // 新創(chuàng)建一個(gè)Person類 
    public class Person{ 
      private String name; 
      private int age; 
      /** Need to allow bean to be created via reflection */ 
      public PersonBean() { 
      } 
      public PersonBean(String name, int age) { 
        this.name = name; 
        this.age = age; 
      } 
      //省略set, get方法 
      public String toString() { 
        return "PersonBean[name='" + name + "',age='" + age + "']"; 
      } 
    } 
     
    //再創(chuàng)建一個(gè)WriteApp類： 
    import java.io.StringWriter; 
    import org.apache.commons.betwixt.io.BeanWriter; 
    public class WriteApp { 
    /** 
    * 創(chuàng)建一個(gè)例子Bean，并將它轉(zhuǎn)化為XML. 
    */ 
    public static final void main(String [] args) throws Exception { 
      // 先創(chuàng)建一個(gè)StringWriter，我們將把它寫入為一個(gè)字符串     
      StringWriter outputWriter = new StringWriter(); 
      // Betwixt在這里僅僅是將Bean寫入為一個(gè)片斷 
      // 所以如果要想完整的XML內(nèi)容，我們應(yīng)該寫入頭格式 
      outputWriter.write(“<?xml version='1.0′ encoding='UTF-8′ ?>\n”); 
      // 創(chuàng)建一個(gè)BeanWriter，其將寫入到我們預(yù)備的stream中 
      BeanWriter beanWriter = new BeanWriter(outputWriter); 
      // 配置betwixt 
      // 更多詳情請(qǐng)參考java docs 或最新的文檔 
      beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false); 
      beanWriter.getBindingConfiguration().setMapIDs(false); 
      beanWriter.enablePrettyPrint(); 
      // 如果這個(gè)地方不傳入XML的根節(jié)點(diǎn)名，Betwixt將自己猜測(cè)是什么 
      // 但是讓我們將例子Bean名作為根節(jié)點(diǎn)吧 
      beanWriter.write(“person”, new PersonBean(“John Smith”, 21)); 
      //輸出結(jié)果 
      System.out.println(outputWriter.toString()); 
      // Betwixt寫的是片斷而不是一個(gè)文檔，所以不要自動(dòng)的關(guān)閉掉writers或者streams， 
      //但這里僅僅是一個(gè)例子，不會(huì)做更多事情，所以可以關(guān)掉 
      outputWriter.close(); 
      } 
    } 
  //2、 將XML轉(zhuǎn)化為JavaBean 
    import java.io.StringReader; 
    import org.apache.commons.betwixt.io.BeanReader; 
    public class ReadApp { 
    public static final void main(String args[]) throws Exception{ 
      // 先創(chuàng)建一個(gè)XML，由于這里僅是作為例子，所以我們硬編碼了一段XML內(nèi)容 
      StringReader xmlReader = new StringReader( 
      "<?xml version='1.0′ encoding='UTF-8′ ?> <person><age>25</age><name>James Smith</name></person>"); 
      //創(chuàng)建BeanReader 
      BeanReader beanReader = new BeanReader(); 
      //配置reader 
      beanReader.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false); 
      beanReader.getBindingConfiguration().setMapIDs(false); 
      //注冊(cè)beans，以便betwixt知道XML將要被轉(zhuǎn)化為一個(gè)什么Bean 
      beanReader.registerBeanClass("person", PersonBean.class); 
      //現(xiàn)在我們對(duì)XML進(jìn)行解析 
      PersonBean person = (PersonBean) beanReader.parse(xmlReader); 
      //輸出結(jié)果 
      System.out.println(person); 
      } 
    }

//Base64編解碼 
  private static String encodeTest(String str){ 
      Base64 base64 = new Base64(); 
      try { 
        str = base64.encodeToString(str.getBytes("UTF-8")); 
      } catch (UnsupportedEncodingException e) { 
        e.printStackTrace(); 
      } 
        System.out.println("Base64 編碼后："+str); 
      return str; 
    } 
   
    private static void decodeTest(String str){ 
      Base64 base64 = new Base64(); 
      //str = Arrays.toString(Base64.decodeBase64(str)); 
      str = new String(Base64.decodeBase64(str)); 
      System.out.println("Base64 解碼后："+str); 
    }

/** 
      * 得到集合里按順序存放的key之后的某一Key 
      */ 
      OrderedMap map = new LinkedMap(); 
      map.put("FIVE", "5"); 
      map.put("SIX", "6"); 
      map.put("SEVEN", "7"); 
      map.firstKey(); // returns "FIVE" 
      map.nextKey("FIVE"); // returns "SIX" 
      map.nextKey("SIX"); // returns "SEVEN"  
     
      /** 
      * 通過key得到value 
      * 通過value得到key 
      * 將map里的key和value對(duì)調(diào) 
      */ 
     
      BidiMap bidi = new TreeBidiMap(); 
      bidi.put("SIX", "6"); 
      bidi.get("SIX"); // returns "6" 
      bidi.getKey("6"); // returns "SIX" 
      //    bidi.removeValue("6"); // removes the mapping 
      BidiMap inverse = bidi.inverseBidiMap(); // returns a map with keys and values swapped 
      System.out.println(inverse); 
   
      /** 
       * 得到兩個(gè)集合中相同的元素 
       */ 
      List<String> list1 = new ArrayList<String>(); 
      list1.add("1"); 
      list1.add("2"); 
      list1.add("3"); 
      List<String> list2 = new ArrayList<String>(); 
      list2.add("2"); 
      list2.add("3"); 
      list2.add("5"); 
      Collection c = CollectionUtils.retainAll(list1, list2); 
      System.out.println(c);

//創(chuàng)建壓縮對(duì)象 
    ZipArchiveEntry entry = new ZipArchiveEntry("CompressTest"); 
     //要壓縮的文件 
     File f=new File("e:\\test.pdf"); 
     FileInputStream fis=new FileInputStream(f); 
     //輸出的對(duì)象 壓縮的文件 
     ZipArchiveOutputStream zipOutput=new ZipArchiveOutputStream(new File("e:\\test.zip"));  
     zipOutput.putArchiveEntry(entry); 
     int i=0,j; 
     while((j=fis.read()) != -1) 
     {  
      zipOutput.write(j); 
      i++; 
      System.out.println(i); 
     } 
     zipOutput.closeArchiveEntry(); 
     zipOutput.close(); 
     fis.close();

//舉一個(gè)Properties的簡(jiǎn)單例子 
  # usergui.properties 
  colors.background = #FFFFFF 
  colors.foreground = #000080 
  window.width = 500 
  window.height = 300 
   
  PropertiesConfiguration config = new PropertiesConfiguration("usergui.properties"); 
  config.setProperty("colors.background", "#000000); 
  config.save(); 
   
  config.save("usergui.backup.properties);//save a copy 
  Integer integer = config.getInteger("window.width");

import javax.sql.DataSource; 
  import java.sql.Connection; 
  import java.sql.Statement; 
  import java.sql.ResultSet; 
  import java.sql.SQLException; 
   
  import org.apache.commons.pool.ObjectPool; 
  import org.apache.commons.pool.impl.GenericObjectPool; 
  import org.apache.commons.dbcp.ConnectionFactory; 
  import org.apache.commons.dbcp.PoolingDataSource; 
  import org.apache.commons.dbcp.PoolableConnectionFactory; 
  import org.apache.commons.dbcp.DriverManagerConnectionFactory; 
  //官方示例 
  public class PoolingDataSources { 
   
    public static void main(String[] args) { 
      System.out.println("加載jdbc驅(qū)動(dòng)"); 
      try { 
      Class.forName("oracle.jdbc.driver.OracleDriver"); 
      } catch (ClassNotFoundException e) { 
      e.printStackTrace(); 
      } 
      System.out.println("Done."); 
      // 
      System.out.println("設(shè)置數(shù)據(jù)源"); 
      DataSource dataSource = setupDataSource("jdbc:oracle:thin:@localhost:1521:test"); 
      System.out.println("Done."); 
       
      // 
      Connection conn = null; 
      Statement stmt = null; 
      ResultSet rset = null; 
       
      try { 
      System.out.println("Creating connection."); 
      conn = dataSource.getConnection(); 
      System.out.println("Creating statement."); 
      stmt = conn.createStatement(); 
      System.out.println("Executing statement."); 
      rset = stmt.executeQuery("select * from person"); 
      System.out.println("Results:"); 
      int numcols = rset.getMetaData().getColumnCount(); 
      while(rset.next()) { 
      for(int i=0;i<=numcols;i++) { 
      System.out.print("\t" + rset.getString(i)); 
      } 
      System.out.println(""); 
      } 
      } catch(SQLException e) { 
      e.printStackTrace(); 
      } finally { 
      try { if (rset != null) rset.close(); } catch(Exception e) { } 
      try { if (stmt != null) stmt.close(); } catch(Exception e) { } 
      try { if (conn != null) conn.close(); } catch(Exception e) { } 
      } 
      } 
   
    public static DataSource setupDataSource(String connectURI) { 
      //設(shè)置連接地址 
      ConnectionFactory connectionFactory = new DriverManagerConnectionFactory( 
          connectURI, null); 
   
      // 創(chuàng)建連接工廠 
      PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory( 
          connectionFactory); 
   
      //獲取GenericObjectPool 連接的實(shí)例 
      ObjectPool connectionPool = new GenericObjectPool( 
          poolableConnectionFactory); 
   
      // 創(chuàng)建 PoolingDriver 
      PoolingDataSource dataSource = new PoolingDataSource(connectionPool); 
       
      return dataSource; 
    } 
  }

import org.apache.commons.dbutils.DbUtils; 
  import org.apache.commons.dbutils.QueryRunner; 
  import org.apache.commons.dbutils.handlers.BeanListHandler; 
  import java.sql.Connection; 
  import java.sql.DriverManager; 
  import java.sql.SQLException; 
  import java.util.List; 
  //轉(zhuǎn)換成list 
  public class BeanLists { 
    public static void main(String[] args) { 
      Connection conn = null; 
      String url = "jdbc:mysql://localhost:3306/ptest"; 
      String jdbcDriver = "com.mysql.jdbc.Driver"; 
      String user = "root"; 
      String password = "ptest"; 
   
      DbUtils.loadDriver(jdbcDriver); 
      try { 
        conn = DriverManager.getConnection(url, user, password); 
        QueryRunner qr = new QueryRunner(); 
        List results = (List) qr.query(conn, "select id,name from person", new BeanListHandler(Person.class)); 
        for (int i = 0; i < results.size(); i++) { 
          Person p = (Person) results.get(i); 
          System.out.println("id:" + p.getId() + ",name:" + p.getName()); 
        } 
      } catch (SQLException e) { 
        e.printStackTrace(); 
      } finally { 
        DbUtils.closeQuietly(conn); 
      } 
    } 
  } 
   
  public class Person{ 
    private Integer id; 
    private String name; 
   
    //省略set, get方法 
  } 
   
  import org.apache.commons.dbutils.DbUtils; 
  import org.apache.commons.dbutils.QueryRunner; 
  import org.apache.commons.dbutils.handlers.MapListHandler; 
   
  import java.sql.Connection; 
  import java.sql.DriverManager; 
  import java.sql.SQLException; 
   
  import java.util.List; 
  import java.util.Map; 
  //轉(zhuǎn)換成map 
  public class MapLists { 
    public static void main(String[] args) { 
      Connection conn = null; 
      String url = "jdbc:mysql://localhost:3306/ptest"; 
      String jdbcDriver = "com.mysql.jdbc.Driver"; 
      String user = "root"; 
      String password = "ptest"; 
   
      DbUtils.loadDriver(jdbcDriver); 
      try { 
        conn = DriverManager.getConnection(url, user, password); 
        QueryRunner qr = new QueryRunner(); 
        List results = (List) qr.query(conn, "select id,name from person", new MapListHandler()); 
        for (int i = 0; i < results.size(); i++) { 
          Map map = (Map) results.get(i); 
          System.out.println("id:" + map.get("id") + ",name:" + map.get("name")); 
        } 
      } catch (SQLException e) { 
        e.printStackTrace(); 
      } finally { 
        DbUtils.closeQuietly(conn); 
      } 
    } 
  }

//用commons email發(fā)送郵件 
  public static void main(String args[]){ 
      Email email = new SimpleEmail(); 
      email.setHostName("smtp.googlemail.com"); 
      email.setSmtpPort(465); 
      email.setAuthenticator(new DefaultAuthenticator("username", "password")); 
      email.setSSLOnConnect(true); 
      email.setFrom("user@gmail.com"); 
      email.setSubject("TestMail"); 
      email.setMsg("This is a test mail ... :-)"); 
      email.addTo("foo@bar.com"); 
      email.send(); 
    }

//官方示例： 
  //* 檢查請(qǐng)求是否含有上傳文件 
    // Check that we have a file upload request 
    boolean isMultipart = ServletFileUpload.isMultipartContent(request); 
   
    //現(xiàn)在我們得到了items的列表 
   
    //如果你的應(yīng)用近于最簡(jiǎn)單的情況，上面的處理就夠了。但我們有時(shí)候還是需要更多的控制。 
    //下面提供了幾種控制選擇： 
    // Create a factory for disk-based file items 
    DiskFileItemFactory factory = new DiskFileItemFactory(); 
   
    // Set factory constraints 
    factory.setSizeThreshold(yourMaxMemorySize); 
    factory.setRepository(yourTempDirectory); 
   
    // Create a new file upload handler 
    ServletFileUpload upload = new ServletFileUpload(factory); 
   
    // 設(shè)置最大上傳大小 
    upload.setSizeMax(yourMaxRequestSize); 
   
    // 解析所有請(qǐng)求 
    List /* FileItem */ items = upload.parseRequest(request); 
   
    // Create a factory for disk-based file items 
    DiskFileItemFactory factory = new DiskFileItemFactory( 
        yourMaxMemorySize, yourTempDirectory); 
   
    //一旦解析完成，你需要進(jìn)一步處理item的列表。 
    // Process the uploaded items 
    Iterator iter = items.iterator(); 
    while (iter.hasNext()) { 
      FileItem item = (FileItem) iter.next(); 
   
      if (item.isFormField()) { 
        processFormField(item); 
      } else { 
        processUploadedFile(item); 
      } 
    } 
   
    //區(qū)分?jǐn)?shù)據(jù)是否為簡(jiǎn)單的表單數(shù)據(jù)，如果是簡(jiǎn)單的數(shù)據(jù)： 
    // processFormField 
    if (item.isFormField()) { 
      String name = item.getFieldName(); 
      String value = item.getString(); 
      //...省略步驟 
    } 
   
    //如果是提交的文件： 
    // processUploadedFile 
    if (!item.isFormField()) { 
      String fieldName = item.getFieldName(); 
      String fileName = item.getName(); 
      String contentType = item.getContentType(); 
      boolean isInMemory = item.isInMemory(); 
      long sizeInBytes = item.getSize(); 
      //...省略步驟 
    } 
   
    //對(duì)于這些item，我們通常要把它們寫入文件，或轉(zhuǎn)為一個(gè)流 
    // Process a file upload 
    if (writeToFile) { 
      File uploadedFile = new File(...); 
      item.write(uploadedFile); 
    } else { 
      InputStream uploadedStream = item.getInputStream(); 
      //...省略步驟 
      uploadedStream.close(); 
    } 
   
    //或轉(zhuǎn)為字節(jié)數(shù)組保存在內(nèi)存中： 
    // Process a file upload in memory 
    byte[] data = item.get(); 
    //...省略步驟 
    //如果這個(gè)文件真的很大，你可能會(huì)希望向用戶報(bào)告到底傳了多少到服務(wù)端，讓用戶了解上傳的過程 
    //Create a progress listener 
    ProgressListener progressListener = new ProgressListener(){ 
      public void update(long pBytesRead, long pContentLength, int pItems) { 
        System.out.println("We are currently reading item " + pItems); 
        if (pContentLength == -1) { 
          System.out.println("So far, " + pBytesRead + " bytes have been read."); 
        } else { 
          System.out.println("So far, " + pBytesRead + " of " + pContentLength 
                   + " bytes have been read."); 
        } 
      } 
    }; 
    upload.setProgressListener(progressListener);

//GET方法 
  import java.io.IOException; 
  import org.apache.commons.httpclient.*; 
  import org.apache.commons.httpclient.methods.GetMethod; 
  import org.apache.commons.httpclient.params.HttpMethodParams; 
   
  public class GetSample{ 
    public static void main(String[] args) { 
      // 構(gòu)造HttpClient的實(shí)例 
      HttpClient httpClient = new HttpClient(); 
      // 創(chuàng)建GET方法的實(shí)例 
      GetMethod getMethod = new GetMethod("http://www.ibm.com"); 
      // 使用系統(tǒng)提供的默認(rèn)的恢復(fù)策略 
      getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
          new DefaultHttpMethodRetryHandler()); 
      try { 
        // 執(zhí)行g(shù)etMethod 
        int statusCode = httpClient.executeMethod(getMethod); 
        if (statusCode != HttpStatus.SC_OK) { 
          System.err.println("Method failed: " 
              + getMethod.getStatusLine()); 
        } 
        // 讀取內(nèi)容 
        byte[] responseBody = getMethod.getResponseBody(); 
        // 處理內(nèi)容 
        System.out.println(new String(responseBody)); 
      } catch (HttpException e) { 
        // 發(fā)生致命的異常，可能是協(xié)議不對(duì)或者返回的內(nèi)容有問題 
        System.out.println("Please check your provided http address!"); 
        e.printStackTrace(); 
      } catch (IOException e) { 
        // 發(fā)生網(wǎng)絡(luò)異常 
        e.printStackTrace(); 
      } finally { 
        // 釋放連接 
        getMethod.releaseConnection(); 
      } 
    } 
  } 
   
  //POST方法 
  import java.io.IOException; 
  import org.apache.commons.httpclient.*; 
  import org.apache.commons.httpclient.methods.PostMethod; 
  import org.apache.commons.httpclient.params.HttpMethodParams; 
   
  public class PostSample{ 
    public static void main(String[] args) { 
      // 構(gòu)造HttpClient的實(shí)例 
      HttpClient httpClient = new HttpClient(); 
      // 創(chuàng)建POST方法的實(shí)例 
      String url = "http://www.oracle.com/"; 
      PostMethod postMethod = new PostMethod(url); 
      // 填入各個(gè)表單域的值 
      NameValuePair[] data = { new NameValuePair("id", "youUserName"), 
      new NameValuePair("passwd", "yourPwd") }; 
      // 將表單的值放入postMethod中 
      postMethod.setRequestBody(data); 
      // 執(zhí)行postMethod 
      int statusCode = httpClient.executeMethod(postMethod); 
      // HttpClient對(duì)于要求接受后繼服務(wù)的請(qǐng)求，象POST和PUT等不能自動(dòng)處理轉(zhuǎn)發(fā) 
      // 301或者302 
      if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY ||  
      statusCode == HttpStatus.SC_MOVED_TEMPORARILY) { 
        // 從頭中取出轉(zhuǎn)向的地址 
        Header locationHeader = postMethod.getResponseHeader("location"); 
        String location = null; 
        if (locationHeader != null) { 
         location = locationHeader.getValue(); 
         System.out.println("The page was redirected to:" + location); 
        } else { 
         System.err.println("Location field value is null."); 
        } 
        return; 
      } 
    } 
  }

//1．讀取Stream 
   
  //標(biāo)準(zhǔn)代碼： 
  InputStream in = new URL( "http://jakarta.apache.org" ).openStream(); 
  try { 
      InputStreamReader inR = new InputStreamReader( in ); 
      BufferedReader buf = new BufferedReader( inR ); 
      String line; 
      while ( ( line = buf.readLine() ) != null ) { 
       System.out.println( line ); 
      } 
   } finally { 
    in.close(); 
   } 
   
  //使用IOUtils 
   
  InputStream in = new URL( "http://jakarta.apache.org" ).openStream(); 
  try { 
    System.out.println( IOUtils.toString( in ) ); 
  } finally { 
    IOUtils.closeQuietly(in); 
  } 
   
  //2．讀取文件 
  File file = new File("/commons/io/project.properties"); 
  List lines = FileUtils.readLines(file, "UTF-8"); 
  //3．察看剩余空間 
  long freeSpace = FileSystemUtils.freeSpace("C:/");

// 1 合并兩個(gè)數(shù)組: org.apache.commons.lang. ArrayUtils 
    // 有時(shí)我們需要將兩個(gè)數(shù)組合并為一個(gè)數(shù)組，用ArrayUtils就非常方便，示例如下： 
    private static void testArr() { 
      String[] s1 = new String[] { "1", "2", "3" }; 
      String[] s2 = new String[] { "a", "b", "c" }; 
      String[] s = (String[]) ArrayUtils.addAll(s1, s2); 
      for (int i = 0; i < s.length; i++) { 
        System.out.println(s[i]); 
      } 
      String str = ArrayUtils.toString(s); 
      str = str.substring(1, str.length() - 1); 
      System.out.println(str + ">>" + str.length()); 
   
    } 
    //2 截取從from開始字符串 
    StringUtils.substringAfter("SELECT * FROM PERSON ", "from"); 
    //3 判斷該字符串是不是為數(shù)字(0~9)組成，如果是，返回true 但該方法不識(shí)別有小數(shù)點(diǎn)和 請(qǐng)注意。 
    StringUtils.isNumeric("454534"); //返回true 
    //4.取得類名 
      System.out.println(ClassUtils.getShortClassName(Test.class)); 
      //取得其包名 
      System.out.println(ClassUtils.getPackageName(Test.class)); 
      
      //5.NumberUtils 
      System.out.println(NumberUtils.stringToInt("6")); 
      //6.五位的隨機(jī)字母和數(shù)字 
      System.out.println(RandomStringUtils.randomAlphanumeric(5)); 
      //7.StringEscapeUtils 
      System.out.println(StringEscapeUtils.escapeHtml("<html>")); 
      //輸出結(jié)果為&lt;html&gt; 
      System.out.println(StringEscapeUtils.escapeJava("String")); 
      
      //8.StringUtils,判斷是否是空格字符 
      System.out.println(StringUtils.isBlank("  ")); 
      //將數(shù)組中的內(nèi)容以,分隔 
      System.out.println(StringUtils.join(test,",")); 
      //在右邊加下字符,使之總長(zhǎng)度為6 
      System.out.println(StringUtils.rightPad("abc", 6, 'T')); 
      //首字母大寫 
      System.out.println(StringUtils.capitalize("abc")); 
      //Deletes all whitespaces from a String 刪除所有空格 
      System.out.println( StringUtils.deleteWhitespace("  ab c ")); 
      //判斷是否包含這個(gè)字符 
      System.out.println( StringUtils.contains("abc", "ba")); 
      //表示左邊兩個(gè)字符 
      System.out.println( StringUtils.left("abc", 2)); 
      System.out.println(NumberUtils.stringToInt("33"));

import org.apache.commons.logging.Log; 
  import org.apache.commons.logging.LogFactory; 
   
    public class CommonLogTest { 
     private static Log log = LogFactory.getLog(CommonLogTest.class); 
     //日志打印 
     public static void main(String[] args) { 
       log.error("ERROR"); 
       log.debug("DEBUG"); 
       log.warn("WARN"); 
       log.info("INFO"); 
       log.trace("TRACE"); 
     System.out.println(log.getClass()); 
     } 
   
    }

// 獲取日期驗(yàn)證 
     DateValidator validator = DateValidator.getInstance(); 
   
     // 驗(yàn)證/轉(zhuǎn)換日期 
     Date fooDate = validator.validate(fooString, "dd/MM/yyyy"); 
     if (fooDate == null) { 
       // 錯(cuò)誤 不是日期 
       return; 
     }

// 設(shè)置參數(shù) 
     boolean caseSensitive = false; 
     String regex1  = "^([A-Z]*)(?:\\-)([A-Z]*)*$" 
     String regex2  = "^([A-Z]*)$"; 
     String[] regexs = new String[] {regex1, regex1}; 
   
     // 創(chuàng)建驗(yàn)證 
     RegexValidator validator = new RegexValidator(regexs, caseSensitive); 
   
     // 驗(yàn)證返回boolean 
     boolean valid = validator.isValid("abc-def"); 
   
     // 驗(yàn)證返回字符串 
     String result = validator.validate("abc-def"); 
   
     // 驗(yàn)證返回?cái)?shù)組 
     String[] groups = validator.match("abc-def");

<form-validation> 
    <global> 
      <validator name="required" 
       classname="org.apache.commons.validator.TestValidator" 
       method="validateRequired" 
       methodParams="java.lang.Object, org.apache.commons.validator.Field"/> 
    </global> 
    <formset> 
    </formset> 
  </form-validation> 
   
  添加姓名驗(yàn)證. 
   
  <form-validation> 
    <global> 
      <validator name="required" 
       classname="org.apache.commons.validator.TestValidator" 
       method="validateRequired" 
       methodParams="java.lang.Object, org.apache.commons.validator.Field"/> 
    </global> 
    <formset> 
      <form name="nameForm"> 
       <field property="firstName" depends="required"> 
         <arg0 key="nameForm.firstname.displayname"/> 
       </field> 
       <field property="lastName" depends="required"> 
         <arg0 key="nameForm.lastname.displayname"/> 
       </field> 
      </form> 
    </formset> 
  </form-validation>

Excerpts from org.apache.commons.validator.RequiredNameTest 
//加載驗(yàn)證配置文件 
InputStream in = this.getClass().getResourceAsStream("validator-name-required.xml"); 
 
ValidatorResources resources = new ValidatorResources(in); 
//這個(gè)是自己創(chuàng)建的bean 我這里省略了 
Name name = new Name(); 
 
Validator validator = new Validator(resources, "nameForm"); 
//設(shè)置參數(shù) 
validator.setParameter(Validator.BEAN_PARAM, name); 
 
 
Map results = null; 
//驗(yàn)證 
results = validator.validate(); 
 
if (results.get("firstName") == null) { 
  //驗(yàn)證成功 
} else { 
  //有錯(cuò)誤   int errors = ((Integer)results.get("firstName")).intValue(); 
}