struts2 实现自定义标签

/*** lostingz* Created on 2015年11月18日*/
package com.test.web.tags;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 TestTag extends ComponentTagSupport {private static final long serialVersionUID = 1L;private String code;/*** 获得一个基本类的对象。** @param stack* @param req* @param res* @return*/@Overridepublic Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {return new TestComponent(stack);}/*** 设置标签获取到的code对象。* @param code*/public void setCode(String code) {this.code = code;}protected void populateParams() {super.populateParams();TestComponent testComponent = (TestComponent) component;//将code赋值给compnent
        testComponent.setCode(code);}}

/*** lostingz* Created on 2015年11月18日*/
package com.test.web.tags;import java.io.IOException;
import java.io.Writer;import org.apache.struts2.components.Component;
import com.opensymphony.xwork2.util.ValueStack;public class TestComponent extends Component {private String code;public TestComponent(ValueStack stack) {super(stack);}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public boolean start(Writer writer) {boolean flag = true;try {String result = getInfo(code);
　　　　　　　//输出writer.write(result);} catch (IOException e) {e.printStackTrace();}return flag;}public boolean end(Writer writer, String body) {return super.end(writer, body);}private String getInfo(String code){
　　　　　//处理code得到显示的信息return doSomething(code);}}

配置

<taglib>   <tlib-version>2.2.3</tlib-version>   <jsp-version>1.2</jsp-version>   <short-name>test</short-name>   <uri>/testTag</uri><display-name>"test"</display-name>   <tag>   <name>getCode</name>   <tag-class>com.test.web.tags.TestTag</tag-class>    <body-content>empty</body-content>       <attribute>   <name>code</name>   <required>false</required>   <rtexprvalue>true</rtexprvalue>   </attribute></tag>   
</taglib>