struts2 自定义tag标签

在项目中可能有很多相同的jsp页面表示功能，这时可以使用自定义的tag进行定义，渐少重复的工作量便于日后维护！

下面就基于struts2进行自定义标签的定义与实现：

首先：自定义类MyTag继承struts2的Component

package cookielogin;

import java.io.IOException;

import java.io.Writer;

import org.apache.struts2.components.Component;

import com.opensymphony.xwork2.util.ValueStack;

public class MyTag extends Component {

	private ValueStack stack;

	private String text;

	private String name;

	private String defaultValue;

	@Override

	public boolean start(Writer writer) {

<span style="white-space:pre">		</span>//这里进行页面的输出

		try {

			writer.write("<h1>" + this.text + "</h1>");

			writer.write("<input name='text' value=");

			writer.write(this.getName());

			writer.write(" name='" + this.getName() + "'>");

		} catch (IOException e) {

			e.printStackTrace();

		}

		return super.start(writer);

	}

	public MyTag(ValueStack stack) {

		super(stack);

		this.stack = stack;

	}

	public ValueStack getStack() {

		return stack;

	}

	public void setStack(ValueStack stack) {

		this.stack = stack;

	}

	public String getText() {

		return text;

	}

	public void setText(String text) {

		this.text = text;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public String getDefaultValue() {

		return defaultValue;

	}

	public void setDefaultValue(String defaultValue) {

		this.defaultValue = defaultValue;

	}

}

2：指定标签类MyTagSupport继承ComponentTagSupport

package cookielogin;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.components.Component;

import org.apache.struts2.views.jsp.ComponentTagSupport;

import com.opensymphony.xwork2.util.ValueStack;

public class MyTagSupport extends ComponentTagSupport {

	private static final long serialVersionUID = 3586338980857274359L;

	String name;

	String text;

	@Override

	public Component getBean(ValueStack stack, HttpServletRequest req,

			HttpServletResponse res) {

		return new MyTag(stack);

	}

	@Override

	// 设置bean值

	protected void populateParams() {

		System.out.println("开始设置参数！populateParams");

		MyTag tag = (MyTag) getComponent();

		tag.setName(name);

		tag.setText(text);

		tag.setDefaultValue("我就是默认值！咋滴！！");

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public String getText() {

		return text;

	}

	public void setText(String text) {

		this.text = text;

	}

}

java代码完成后，进行配置文件的编写，在WEB-INF/tlds 新建自定义文件tags-custom.tld

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE taglib PUBLIC

	"-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"

	"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">

<taglib>

	<tlib-version>2.0</tlib-version>

	<jsp-version>1.2</jsp-version>

	<short-name>ctags</short-name>

	<uri>http://www.cml.com/tags-custom</uri>

	<description>

	<![CDATA[

		   <p>This is custom tag.</p>

	]]>

	</description>

	<tag>

		<description><![CDATA[我自定义的tag]]></description>

		<name>myTag</name>

		<tag-class>cookielogin.MyTagSupport</tag-class>

		<body-content>JSP</body-content>

		<attribute>

			<description><![CDATA[这个是我自定义的标签]]></description>

			<name>text</name>

			<required>true</required>

		</attribute>

		<attribute>

			<description><![CDATA[这个是我自定义的标签]]></description>

			<name>name</name>

			<required>true</required>

		</attribute>

		<attribute>

			<description><![CDATA[这个是我自定义的标签]]></description>

			<name>defaultValue</name>

			<required>false</required>

		</attribute>

		<dynamic-attributes>false</dynamic-attributes>

	</tag>

</taglib>

前提基础工作完成后，在页面引用：

<%@taglib prefix="d" uri="http://www.cml.com/tags-custom"%>

使用：

<d:myTag text="hhahh" name="sdfsd"></d:myTag>

访问页面后出现：

基于struts2的自定义标签实现完毕！虽然功能很简单，但是基本功能已经实现，可以根据项目的实际需要进行编辑！

巴特西

struts2 自定义tag标签

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