Apache Commons工具集简介
//commons http://www.iswin.org/2015/11/13/Apache-CommonsCollections-Deserialized-Vulnerability/
Apache Commons工具集简介
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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. |
Betwixt | XML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. |
Collections | java集合框架操作. |
Compress | java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. |
java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HttpComponents |
IO | io工具的封装. |
Lang | Java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BeanReader BeanReader beanReader = new BeanReader(); //配置reader beanReader.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Bean beanReader.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 mapping BidiMap inverse = bidi.inverseBidiMap(); // returns a map with keys and values swapped System.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.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");
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 PoolingDriver PoolingDataSource 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; //转换成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); } } }
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("user@gmail.com"); email.setSubject("TestMail"); email.setMsg("This is a test mail ... :-)"); email.addTo("foo@bar.com"); 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 request boolean 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 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); // 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 items DiskFileItemFactory 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 items Iterator 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: // processFormField if (item.isFormField()) { String name = item.getFieldName(); String value = item.getString(); //...省略步骤 } //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 upload if (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 memory byte[] 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 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);
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getMethod int 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postMethod int 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302 if (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IOUtils InputStream 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<html> 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