一、在structs.xml中配置
<structs>
<package name="tagp" namespace="/test" extends="struts-default">
<action name="TagDemo" class="cn.hjp.test.TagDemo">
<result name="success" type="dispatcher">/tag/Index2.jsp</result>
</action>
</package>
</structs>
二、首页Index.jsp页面代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<span style="color:red">生日日期格式：yyyy/MM/dd</span>
<s:form action="TagDemo" namespace="/test">
<s:textfield name="name" label="姓名"></s:textfield>
<s:textfield name="sex" label="性别"></s:textfield>
<s:textfield name="age" label="年龄"></s:textfield>
<s:textfield name="birthday" label="生日"></s:textfield>
<s:submit value="提交"></s:submit>
</s:form>
</body>
</html>
三、Action代码（注意要引用对包）：
如果想实现下面的自动装配，必须这样生成属性setter和getter
public class TagDemo extends ActionSupport {
private String name;
private char sex;
private int age;
private Date birthday;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
System.out.println(this.toString());
return SUCCESS;
}
@Override
public String toString() {
return "TagDemo [name=" + name + ", sex=" + sex + ", age=" + age + ", birthday=" + birthday + "]";
}
}
四、自定义的转换器类（注意引用对包）：
public class MyDateConverter extends DefaultTypeConverter {
@Override
public Object convertValue(Object value, Class toType) {
// TODO Auto-generated method stub
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd");
if (toType == Date.class) {
String[] params = (String[]) value;
try {
return simpleDateFormat.parse(params[0]);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (toType == String.class) {
Date date = (Date) value;
return simpleDateFormat.format(date);
}
throw new RuntimeException("错误");
}
}
五、下面就是配置如何使用自定义的转换器类，分两种：
1、如果只想对某个包下Action里的字段进行格式化，就要在这个包下（和action类同级）新建properties文件，依据上面示例则要建文件TagDemo-conversion.properties
代码：birthday=cn.hjp.test.MyDateConverter
2、如果要对所有时间类型格式化，则要在src根下新建文件xwork-conversion.properties
代码：java.util.Date=cn.hjp.test.MyDateConverter
六、action返回的页面，如果实现页面值的自动加载，也要使用structs标签，Index2.jsp页面代码如下，
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:textfield name="name" label="姓名"></s:textfield>
<s:textfield name="sex" label="性别"></s:textfield>
<s:textfield name="age" label="年龄"></s:textfield>
<s:textfield name="birthday" label="生日"></s:textfield>
</body>
</html>