Apache Commons
工具类大家都有用过,但是可能缺乏系统学习,只用到了一小部分功能,无法发挥极限的价值,肥朝用大白话说就是,一颗好白菜都让猪给拱了! 代码过多,手机观看效果不佳,建议收藏后在电脑上静悄悄地看。因内容健康,可大胆转发,即使未满十八岁,在没有家长陪同下也一样可以观看!
1、BeanUtils
提供了对于JavaBean进行各种操作, 比如对象,属性复制等等。
代码语言:javascript复制//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。
代码语言:javascript复制//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。
代码语言:javascript复制//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
代码语言:javascript复制/**
* 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。
代码语言:javascript复制//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。
- Properties files
- XML documents
- Property list files (.plist)
- JNDI
- JDBC Datasource
- System properties
- Applet parameters
- 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。
代码语言:javascript复制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
代码语言:javascript复制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。
代码语言:javascript复制//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。
代码语言:javascript复制//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.HttpClient
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。
代码语言:javascript复制//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。
代码语言:javascript复制//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。
代码语言:javascript复制// 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。
代码语言:javascript复制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。
1.验证日期
代码语言:javascript复制// 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;
}
2.表达式验证
代码语言:javascript复制// 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");
3.配置文件中使用验证
代码语言:javascript复制<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>
4.验证类
代码语言:javascript复制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();
}