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2015-06-17 15:35 369 查看

自定义标签

新建maven项目taglib

maven pom.xml

<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name></display-name>

<servlet>
<servlet-name>baseServlet</servlet-name>
<servlet-class>com.lyncc.common.base.servlet.BaseServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>baseServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

BaseServlet.java

public class BaseServlet extends HttpServlet{

/**
*
*/
private static final long serialVersionUID = 1L;

private List<String> ls = null;

private List<User> users = null;

@Override
public void init() throws ServletException {
super.init();
}

@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {
ls = new ArrayList<String>();
ls.add("Lyncc");
ls.add("Smile");
ls.add("Ted");
ls.add("Moon");
req.setAttribute("ls", ls);

users = new ArrayList<User>();
User u1 = new User("Lyncc", "123456", true);
User u2 = new User("Smile", "123456", true);
User u3 = new User("Ted", "123456", false);
User u4 = new User("Moon", "123456", true);
User u5 = new User("Th000", "123456", false);
User u6 = new User("Infi", "123456", false);
users.add(u4);
users.add(u3);
users.add(u2);
users.add(u1);
users.add(u5);
users.add(u6);
req.setAttribute("ls2", users);
req.getRequestDispatcher("WEB-INF/view/first.jsp").forward(req,resp);
}

@Override
public void destroy() {
super.destroy();
}
}

User.java

public class User {

private String username;

private String password;

private boolean isVisible;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public boolean isVisible() {
return isVisible;
}

public void setVisible(boolean isVisible) {
this.isVisible = isVisible;
}

public User(String username, String password, boolean isVisible) {
this.username = username;
this.password = password;
this.isVisible = isVisible;
}

}

first.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="o" uri="/WEB-INF/tld/original.tld" %>
<!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>test</title>
</head>
<body>
<c:forEach items="${ls}" var="str">
${o:formatSpecial(str)}<br>
</c:forEach>
<c:forEach items="${o:showVisible(ls2)}" var="u">
${u.username}=====${u.password}=====${u.visible}<br>
</c:forEach>
</body>
</html>

original.tld

<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<tlib-version>2.0</tlib-version>
<function>
<name>formatSpecial</name>
<function-class>com.lyncc.common.taglib.util.OpenTaglibFunctions</function-class>
<function-signature>java.lang.String formatSpecial(java.lang.String)</function-signature>
</function>

<function>
<name>showVisible</name>
<function-class>com.lyncc.common.taglib.util.OpenTaglibFunctions</function-class>
<function-signature>java.util.List showVisible(java.util.List)</function-signature>
</function>

</taglib>

OpenTaglibFunctions.java

public class OpenTaglibFunctions {

public static final String formatSpecial(String str){
return str+"war3 player";
}

public static final List<User> showVisible(List<User> u){
if(null==u||u.size()==0)return u;
int size = u.size()-1;
for(int i = size;i>=0;i--){
if(!u.get(i).isVisible())u.remove(i);
}
return u;
}

}

访问http://localhost:8080/taglib/ 可以看见效果，记录一下，有时候挺方便的~

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