转换器（Converter）Struts 2.0中
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转换器（Converter）——Struts 2.0中的魔术师
package tutorial;
import java.util.Locale;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.util.LocalizedTextUtil;
public class HelloWorld extends ActionSupport {
private String msg;
private Locale loc = Locale.US;
public String getMsg() {
return msg;
}
public Locale getLoc() {
return loc;
}
public void setLoc(Locale loc) {
this .loc = loc;
}
@Override
public String execute() {
// LocalizedTextUtil是Struts 2.0中国际化的工具类，<s:text>标志就是通过调用它实现国际化的
msg = LocalizedTextUtil.findDefaultText( " HelloWorld " , loc);
return SUCCESS;
}
}
然后，在源代码文件夹下的struts.xml加入如下代码新建Action：
< package name ="ConverterDemo" extends ="struts-default" >
< action name ="HelloWorld" class ="tutorial.HelloWorld" >
< result > /HelloWorld.jsp </ result >
</ action >
</ package >
再在Web文件夹下，新建 HelloWorld.jsp，代码如下：
< %@ page contentType ="text/html; charset=UTF-8" % >
< %@taglib prefix ="s" uri ="/struts-tags" % >
< html >
< head >
< title > Hello World </ title >
</ head >
< body >
< s:form action ="HelloWorld" theme ="simple" >
Locale: < s:textfield name ="loc" /> < s:submit />
</ s:form >
< h2 >< s:property value ="msg" /></ h2 >
</ body >
</ html >
接下来，在源代码文件夹的tutorial包中新建LocaleConverter.java文件，代码如下：
package tutorial;
import java.util.Locale;
import java.util.Map;
public class LocaleConverter extends ognl.DefaultTypeConverter {
@Override
public Object convertValue(Map context, Object value, Class toType) {
if (toType == Locale. class ) {
String locale = ((String[]) value)[ 0 ];
return new Locale(locale.substring( 0 , 2 ), locale.substring( 3
));
} else if (toType == String. class ) {
Locale locale = (Locale) value;
return locale.toString();
}
return null ;
}
}
再接下来，在源代码文件夹下新建xwork-conversion.properties，并在其中添加如下代码： java.util.Locale = tutorial.LocaleConverter > > context——用于获取当前的ActionContext 已有的转换器
package tutorial;
import java.util.Date;
publicclass Product {
private String name;
privatedouble price;
private Date dateOfProduction;
public Date getDateOfProduction() {
return dateOfProduction;
}
publicvoid setDateOfProduction(Date dateOfProduction) {
this.dateOfProduction = dateOfProduction;
}
public String getName() {
return name;
}
publicvoid setName(String name) {
this.name = name;
}
publicdouble getPrice() {
return price;
}
publicvoid setPrice(double price) {
this.price = price;
}
}
然后，在同上的包下添加ProductConfirm.java类，代码如下：
package tutorial;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
publicclass ProductConfirm extends ActionSupport {
public List<Product> products;
public List<Product> getProducts() {
return products;
}
publicvoid setProducts(List<Product> products) {
this.products = products;
}
@Override
public String execute() {
for(Product p : products) {
System.out.println(p.getName() + " | "+ p.getPrice() +" | " +
p.getDateOfProduction());
}
return SUCCESS;
}
}
接看，在同上的包中加入ProductConfirm-conversion.properties，代码如下： Element_products=tutorial.Product <action name="ProductConfirm" class="tutorial.ProductConfirm">
<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
</head>
<body>
<s:form action="ProductConfirm" theme="simple">
<table>
<tr style="background-color:powderblue; font-weight:bold;">
<td>Product Name</td>
<td>Price</td>
<td>Date of production</td>
</tr>
<s:iterator value="new int[3]" status="stat">
<tr>
<td><s:textfield
name="%{'products['+#stat.index+'].name'}"/></td>
<td><s:textfield
name="%{'products['+#stat.index+'].price'}"/></td>
<td><s:textfield
name="%{'products['+#stat.index+'].dateOfProduction'}"/></td>
</tr>
</s:iterator>
<tr>
<td colspan="3"><s:submit /></td>
</tr>
</table>
</s:form>
</body>
</html>
在同样的文件夹下创建ShowProducts.jsp，内容如下：
<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
</head>
<body>
<table>
<tr style="background-color:powderblue; font-weight:bold;">
<td>Product Name</td>
<td>Price</td>
<td>Date of production</td>
</tr>
<s:iterator value="products" status="stat">
<tr>
<td><s:property value="name"/></td>
<td>$<s:property value="price"/></td>
<td><s:property value="dateOfProduction"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
发布运行应用程序，在浏览器中键入 http://localhost:8080/Struts2_Converter/AddProducts.jsp，出现如图4所示页面： > > <result name="input">/AddProducts.jsp</result> > <div style="color:red"> > |
