Apache Commons 公用包

Apache Commons包含了很多开源的工具，用于解决平时编程经常会遇到的问题，减少重复劳动。下面是我这几年做开发过程中自己用过的工具类做简单介绍。

组件功能介绍BeanUtils提供了对于JavaBean进行各种操作，克隆对象,属性等等.BetwixtXML与Java对象之间相互转换.Codec处理常用的编码方法的工具类包 例如DES、SHA1、MD5、Base64等.Collectionsjava集合框架操作.Compressjava提供文件打包 压缩类库.Configuration一个java应用程序的配置管理类库.DBCP提供数据库连接池服务.DbUtils提供对jdbc 的操作封装来简化数据查询和记录读取操作.Emailjava发送邮件 对javamail的封装.FileUpload提供文件上传功能.HttpClien提供HTTP客户端与服务器的各种通讯操作. 现在已改成HttpComponentsIOio工具的封装.LangJava基本对象方法的工具类包 如：StringUtils,ArrayUtils等等.Logging提供的是一个Java 的日志接口.Validator提供了客户端和服务器端的数据验证框架.

1、BeanUtils 提供了对于JavaBean进行各种操作， 比如对象,属性复制等等。

//1、 克隆对象//新创建一个普通Java Bean，用来作为被克隆的对象public class Person {private String name = "";private String email = "";private int age;//省略 set,get方法}//再创建一个Test类，其中在main方法中代码如下：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();}}}//原理也是通过Java的反射机制来做的。//2、 将一个Map对象转化为一个Bean//这个Map对象的key必须与Bean的属性相对应。Map map = new HashMap();map.put("name","tom");map.put("email","tom@");map.put("age","21");//将map转化为一个Person对象Person person = new Person();BeanUtils.populate(person,map);//通过上面的一行代码，此时person的属性就已经具有了上面所赋的值了。//  将一个Bean转化为一个Map对象了，如下：    Map map = BeanUtils.describe(person)

2、Betwixt XML与Java对象之间相互转换。

//1、 将JavaBean转为XML内容// 新创建一个Person类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 + "']";}}//再创建一个WriteApp类：import java.io.StringWriter;import org.apache.commons.betwixt.io.BeanWriter;public class WriteApp {/*** 创建一个例子Bean，并将它转化为XML.*/public static final void main(String [] args) throws Exception {// 先创建一个StringWriter，我们将把它写入为一个字符串       StringWriter outputWriter = new StringWriter();// Betwixt在这里仅仅是将Bean写入为一个片断// 所以如果要想完整的XML内容，我们应该写入头格式outputWriter.write(“<?xml version=’1.0′ encoding=’UTF-8′ ?>\n”);// 创建一个BeanWriter，其将写入到我们预备的stream中BeanWriter beanWriter = new BeanWriter(outputWriter);// 配置betwixt// 更多详情请参考java docs 或最新的文档beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);beanWriter.getBindingConfiguration().setMapIDs(false);beanWriter.enablePrettyPrint();// 如果这个地方不传入XML的根节点名，Betwixt将自己猜测是什么// 但是让我们将例子Bean名作为根节点吧beanWriter.write(“person”, new PersonBean(“John Smith”, 21));//输出结果System.out.println(outputWriter.toString());// Betwixt写的是片断而不是一个文档，所以不要自动的关闭掉writers或者streams，//但这里仅仅是一个例子，不会做更多事情，所以可以关掉outputWriter.close();}}//2、 将XML转化为JavaBeanimport java.io.StringReader;import org.apache.commons.betwixt.io.BeanReader;public class ReadApp {public static final void main(String args[]) throws Exception{// 先创建一个XML，由于这里仅是作为例子，所以我们硬编码了一段XML内容StringReader xmlReader = new StringReader("<?xml version=’1.0′ encoding=’UTF-8′ ?> <person><age>25</age><name>James Smith</name></person>");//创建BeanReaderBeanReader beanReader  = new BeanReader();//配置readerbeanReader.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);beanReader.getBindingConfiguration().setMapIDs(false);//注册beans，以便betwixt知道XML将要被转化为一个什么BeanbeanReader.registerBeanClass("person", PersonBean.class);//现在我们对XML进行解析PersonBean person = (PersonBean) beanReader.parse(xmlReader);//输出结果System.out.println(person);}}

3、Codec 提供了一些公共的编解码实现，比如Base64, Hex, MD5,Phonetic and URLs等等。

//Base64编解码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 编码后："+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 解码后："+str);}

4、Collections 对java.util的扩展封装，处理数据还是挺灵活的。

org.apache.commons.collections – Commons Collections自定义的一组公用的接口和工具类

org.apache.commons.collections.bag – 实现Bag接口的一组类

org.apache.commons.collections.bidimap – 实现BidiMap系列接口的一组类

org.apache.commons.collections.buffer – 实现Buffer接口的一组类

org.apache.commons.collections.collection – 实现java.util.Collection接口的一组类

org.apache.commons.collections.comparators – 实现java.util.Comparator接口的一组类

org.apache.commons.collections.functors – Commons Collections自定义的一组功能类

org.apache.commons.collections.iterators – 实现java.util.Iterator接口的一组类

org.apache.commons.collections.keyvalue – 实现集合和键/值映射相关的一组类

org.apache.commons.collections.list – 实现java.util.List接口的一组类

org.apache.commons.collections.map – 实现Map系列接口的一组类

org.apache.commons.collections.set – 实现Set系列接口的一组类

/*** 得到集合里按顺序存放的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" /*** 通过key得到value* 通过value得到key* 将map里的key和value对调*/BidiMap bidi = new TreeBidiMap();bidi.put("SIX", "6");bidi.get("SIX");  // returns "6"bidi.getKey("6");  // returns "SIX"//     bidi.removeValue("6");  // removes the mappingBidiMap inverse = bidi.inverseBidiMap();  // returns a map with keys and values swappedSystem.out.println(inverse);/** * 得到两个集合中相同的元素 */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);

5、Compress commons compress中的打包、压缩类库。

//创建压缩对象ZipArchiveEntry entry = new ZipArchiveEntry("CompressTest");  //要压缩的文件  File f=new File("e:\\test.pdf");  FileInputStream fis=new FileInputStream(f);  //输出的对象 压缩的文件  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();

6、Configuration 用来帮助处理配置文件的，支持很多种存储方式。
1. Properties files
2. XML documents
3. Property list files (.plist)
4. JNDI
5. JDBC Datasource
6. System properties
7. Applet parameters
8. Servlet parameters

//举一个Properties的简单例子# usergui.propertiescolors.background = #FFFFFFcolors.foreground = #000080window.width = 500window.height = 300PropertiesConfiguration config = new PropertiesConfiguration("usergui.properties");config.setProperty("colors.background", "#000000);config.save();config.save("usergui.backup.properties);//save a copyInteger integer = config.getInteger("window.width");

7、DBCP(Database Connection Pool)是一个依赖Jakarta commons-pool对象池机制的数据库连接池,Tomcat的数据源使用的就是DBCP。

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("加载jdbc驱动"); try { Class.forName("oracle.jdbc.driver.OracleDriver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } System.out.println("Done."); // System.out.println("设置数据源"); 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) {//设置连接地址ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(connectURI, null);// 创建连接工厂PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory);//获取GenericObjectPool 连接的实例ObjectPool connectionPool = new GenericObjectPool(poolableConnectionFactory);// 创建 PoolingDriverPoolingDataSource dataSource = new PoolingDataSource(connectionPool);return dataSource;}}

8、DbUtils Apache组织提供的一个资源JDBC工具类库，它是对JDBC的简单封装，对传统操作数据库的类进行二次封装，可以把结果集转化成List。，同时也不影响程序的性能。

DbUtils类：启动类
ResultSetHandler接口：转换类型接口
MapListHandler类：实现类，把记录转化成List
BeanListHandler类：实现类，把记录转化成List，使记录为JavaBean类型的对象
Qrery Runner类：执行SQL语句的类

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;//转换成listpublic 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;//转换成mappublic 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);        }    }}

9、Email 提供的一个开源的API，是对javamail的封装。

//用commons email发送邮件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("[e-mail]");email.setSubject("TestMail");email.setMsg("This is a test mail ... :-)");email.addTo("[e-mail]");email.send();}

10、FileUpload java web文件上传功能。

//官方示例：//* 检查请求是否含有上传文件// Check that we have a file upload requestboolean isMultipart = ServletFileUpload.isMultipartContent(request);//现在我们得到了items的列表//如果你的应用近于最简单的情况，上面的处理就够了。但我们有时候还是需要更多的控制。//下面提供了几种控制选择：// Create a factory for disk-based file itemsDiskFileItemFactory factory = new DiskFileItemFactory();// Set factory constraintsfactory.setSizeThreshold(yourMaxMemorySize);factory.setRepository(yourTempDirectory);// Create a new file upload handlerServletFileUpload upload = new ServletFileUpload(factory);// 设置最大上传大小upload.setSizeMax(yourMaxRequestSize);// 解析所有请求List /* FileItem */ items = upload.parseRequest(request);// Create a factory for disk-based file itemsDiskFileItemFactory factory = new DiskFileItemFactory(        yourMaxMemorySize, yourTempDirectory);//一旦解析完成，你需要进一步处理item的列表。// Process the uploaded itemsIterator iter = items.iterator();while (iter.hasNext()) {    FileItem item = (FileItem) iter.next();    if (item.isFormField()) {        processFormField(item);    } else {        processUploadedFile(item);    }}//区分数据是否为简单的表单数据，如果是简单的数据：// processFormFieldif (item.isFormField()) {    String name = item.getFieldName();    String value = item.getString();    //...省略步骤}//如果是提交的文件：// processUploadedFileif (!item.isFormField()) {    String fieldName = item.getFieldName();    String fileName = item.getName();    String contentType = item.getContentType();    boolean isInMemory = item.isInMemory();    long sizeInBytes = item.getSize();    //...省略步骤}//对于这些item，我们通常要把它们写入文件，或转为一个流// Process a file uploadif (writeToFile) {    File uploadedFile = new File(...);    item.write(uploadedFile);} else {    InputStream uploadedStream = item.getInputStream();    //...省略步骤    uploadedStream.close();}//或转为字节数组保存在内存中：// Process a file upload in memorybyte[] data = item.get();//...省略步骤//如果这个文件真的很大，你可能会希望向用户报告到底传了多少到服务端，让用户了解上传的过程//Create a progress listenerProgressListener 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);

11、HttpClien 基于HttpCore实 现的一个HTTP/1.1兼容的HTTP客户端，它提供了一系列可重用的客户端身份验证、HTTP状态保持、HTTP连接管理module。

//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) {// 构造HttpClient的实例HttpClient httpClient = new HttpClient();// 创建GET方法的实例GetMethod getMethod = new GetMethod("http://www.ibm.com");// 使用系统提供的默认的恢复策略getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler());try {// 执行getMethodint statusCode = httpClient.executeMethod(getMethod);if (statusCode != HttpStatus.SC_OK) {System.err.println("Method failed: "+ getMethod.getStatusLine());}// 读取内容byte[] responseBody = getMethod.getResponseBody();// 处理内容System.out.println(new String(responseBody));} catch (HttpException e) {// 发生致命的异常，可能是协议不对或者返回的内容有问题System.out.println("Please check your provided http address!");e.printStackTrace();} catch (IOException e) {// 发生网络异常e.printStackTrace();} finally {// 释放连接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) {// 构造HttpClient的实例HttpClient httpClient = new HttpClient();// 创建POST方法的实例String url = "http://www.oracle.com/";PostMethod postMethod = new PostMethod(url);// 填入各个表单域的值NameValuePair[] data = { new NameValuePair("id", "youUserName"),new NameValuePair("passwd", "yourPwd") };// 将表单的值放入postMethod中postMethod.setRequestBody(data);// 执行postMethodint statusCode = httpClient.executeMethod(postMethod);// HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发// 301或者302if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {    // 从头中取出转向的地址    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;}}}

12、IO 对java.io的扩展 操作文件非常方便。

//1．读取Stream//标准代码：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IOUtilsInputStream in = new URL( "http://jakarta.apache.org" ).openStream();try {    System.out.println( IOUtils.toString( in ) );} finally {    IOUtils.closeQuietly(in);}//2．读取文件File file = new File("/commons/io/project.properties");List lines = FileUtils.readLines(file, "UTF-8");//3．察看剩余空间long freeSpace = FileSystemUtils.freeSpace("C:/");

13、Lang 主要是一些公共的工具集合，比如对字符、数组的操作等等。

// 1 合并两个数组: org.apache.commons.lang. ArrayUtils// 有时我们需要将两个数组合并为一个数组，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 截取从from开始字符串StringUtils.substringAfter("SELECT * FROM PERSON ", "from");//3 判断该字符串是不是为数字(0~9)组成，如果是，返回true 但该方法不识别有小数点和 请注意StringUtils.isNumeric("454534"); //返回true//4.取得类名        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"));        //6.五位的随机字母和数字        System.out.println(RandomStringUtils.randomAlphanumeric(5));        //7.StringEscapeUtils        System.out.println(StringEscapeUtils.escapeHtml("<html>"));        //输出结果为&lt;html&gt;        System.out.println(StringEscapeUtils.escapeJava("String"));               //8.StringUtils,判断是否是空格字符        System.out.println(StringUtils.isBlank("   "));        //将数组中的内容以,分隔        System.out.println(StringUtils.join(test,","));        //在右边加下字符,使之总长度为6        System.out.println(StringUtils.rightPad("abc", 6, 'T'));        //首字母大写        System.out.println(StringUtils.capitalize("abc"));        //Deletes all whitespaces from a String 删除所有空格        System.out.println( StringUtils.deleteWhitespace("   ab  c  "));        //判断是否包含这个字符        System.out.println( StringUtils.contains("abc", "ba"));        //表示左边两个字符        System.out.println( StringUtils.left("abc", 2));        System.out.println(NumberUtils.stringToInt("33"));

14、Logging 提供的是一个Java 的日志接口,同时兼顾轻量级和不依赖于具体的日志实现工具。

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()); }}

15、Validator 通用验证系统，该组件提供了客户端和服务器端的数据验证框架。

验证日期

// 获取日期验证      DateValidator validator = DateValidator.getInstance();      // 验证/转换日期      Date fooDate = validator.validate(fooString, "dd/MM/yyyy");      if (fooDate == null) {          // 错误 不是日期          return;      }

表达式验证

// 设置参数      boolean caseSensitive = false;      String regex1   = "^([A-Z]*)(?:\\-)([A-Z]*)*$"      String regex2   = "^([A-Z]*)$";      String[] regexs = new String[] {regex1, regex1};      // 创建验证      RegexValidator validator = new RegexValidator(regexs, caseSensitive);      // 验证返回boolean      boolean valid = validator.isValid("abc-def");      // 验证返回字符串      String result = validator.validate("abc-def");      // 验证返回数组      String[] groups = validator.match("abc-def");

配置文件中使用验证

<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>添加姓名验证.<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> 

验证类

 Excerpts from org.apache.commons.validator.RequiredNameTest//加载验证配置文件InputStream in = this.getClass().getResourceAsStream("validator-name-required.xml");ValidatorResources resources = new ValidatorResources(in);//这个是自己创建的bean 我这里省略了Name name = new Name();Validator validator = new Validator(resources, "nameForm");//设置参数validator.setParameter(Validator.BEAN_PARAM, name);Map results = null;//验证results = validator.validate();if (results.get("firstName") == null) {    //验证成功} else {    //有错误     int errors = ((Integer)results.get("firstName")).intValue();} 

来自：http://zhoualine.iteye.com/blog/1770014