自定义tld 标签
2014-05-08 15:44
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.新建一个标签我们命名为name.tld，注意该文件请放在WEB-INF文件下(与web.xml同级)，运行时会自动加载
<?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>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>name</short-name>
<uri>http://www.yuqiaotech.com/name</uri>
<description>name标签库</description>
<tag>
<name>getName</name>
<tag-class>com.yuqiaotech.pms.webapp.tags.getName</tag-class>
<attribute>
<name>userName</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
</tag>
</taglib>
2.我们现在开始实现标签的getName方法。新建一个包com.yuqiaotech.pms.webapp.tags，该包下有两个文件getName.java和PmsTag.java
getName.java
package com.yuqiaotech.pms.webapp.tags;
import javax.servlet.jsp.JspException;
public class getName extends PmsTag{
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getScope() {
return scope;
}
public void setScope(String scope) {
this.scope = scope;
}
private String scope;
public int doStartTag() throws JspException {
//将值直接进行赋值
String myName=userName+"------通过标签获取的数据";
setAttribute(var,this,pageContext,scope,myName);
return super.doStartTag();
}
}
PmsTag.java注意PmsTag继承了struts自定义标签库TagSupport
package com.yuqiaotech.pms.webapp.tags;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
public class PmsTag extends TagSupport{
protected String var;
public static void setAttribute(String attrName,TagSupport tag,PageContext pageContext,String scope,Object obj){
if (scope != null) {
if (scope.equals("page")) {
pageContext.setAttribute(attrName, obj);
} else if (scope.equals("request"<
1334e
span>)) {
pageContext.getRequest().setAttribute(attrName, obj);
} else if (scope.equals("session")) {
pageContext.getSession().setAttribute(attrName, obj);
} else if (scope.equals("application")) {
pageContext.getServletContext().setAttribute(attrName, obj);
} else {
throw new RuntimeException("Attribute 'scope' must be: page, request, session or application :"+scope);
}
}else{
pageContext.getRequest().setAttribute(attrName, obj);
}
}
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
}
4.书写一个jsp页面注意在querybooks.jsp添加的，该工程可以参看我的文章：eclipse中新建struts工程http://blog.csdn.net/b10090120/article/details/8045271
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<span style="color:#ff0000;"><%@ taglib uri="http://www.yuqiaotech.com/name" prefix="name" %></span>
<html>
<head>
<title>查询图书信息</title>
</head>
<body>
<span style="color:#ff0000;"><name:getName userName="沈维海" var="myName"></name:getName></span>
${myName }
<s:form action="query">
<s:textfield label="书名" name="name" />
<s:submit value="查询"/>
</s:form>
</body>
</html><span style="color:#ff0000;">
</span>
5.运行效果如下：
<c:if test=""> dosometing.... </c:if>
标签实现：判断当前用户是否是超级用户，如果是超级用户，就执行标签体，如果不是则不执行
[java]
view plaincopy
package com.njupt.webapp.tags;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* 是否执行标签体,同时设置变量可使用范围 （默认:pageContext） 参考： jstl:core:if实现原理
* */
public abstract class AuthorityBaseTag extends TagSupport {
private boolean result; /* 是否执行 */
private String var;
private int scope; /* 结果保存范围 */
protected abstract boolean condition() throws JspTagException, JspException;
public AuthorityBaseTag() {
init();
}
public int doStartTag() throws JspException {
this.result = condition();
if (this.result) {
return 1;
}
return 0;
}
public void release() {
super.release();
init();
}
public void setVar(String var) {
this.var = var;
}
public String getVar() {
return this.var;
}
public void setScope(String scope) {
if (scope.equalsIgnoreCase("page"))
this.scope = 1;
else if (scope.equalsIgnoreCase("request"))
this.scope = 2;
else if (scope.equalsIgnoreCase("session"))
this.scope = 3;
else if (scope.equalsIgnoreCase("application"))
this.scope = 4;
}
public int getScope() {
return this.scope;
}
private void init() {
this.result = false;
this.scope = 1;
}
}
[java]
view plaincopy
package com.njupt.webapp.tags;
import javax.servlet.jsp.JspException;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.njupt.dao.Constants;
import com.njupt.dao.UniversalManager;
import com.njupt.model.ClientUser;
import com.njupt.model.CompanyUser;
import com.njupt.utils.TagUtils;
public class IsSuperUserTag extends AuthorityBaseTag{
protected String managerId = "manager";
protected Long userId;
protected String userType;
protected String is;
protected boolean condition() throws JspException
{
Long _userId = (Long)TagUtils.evaluate("userId", userId+"", Long.class, this, pageContext);
String _userType = (String)TagUtils.evaluate("userType", userType, String.class, this, pageContext);
UniversalManager manager = (UniversalManager)getBean(managerId);
boolean isSuper = false;
if(Constants.COMPANY_USER_TYPE.equals(_userType)){
CompanyUser cu = (CompanyUser)manager.queryUniqueResult("from CompanyUser where id=?", new Object[]{_userId});
isSuper = cu.getIsSuperUser();
}
else if(Constants.CLIENT_USER_TYPE.equals(_userType)){
ClientUser cu = (ClientUser)manager.queryUniqueResult("from ClientUser where id=?", new Object[]{_userId});
isSuper = cu.getIsSuperUser();
}
if (getVar() != null)
this.pageContext.setAttribute(getVar(), new String(isSuper?"超级用户身份一验证":"没有权限访问"), getScope());
if (is != null)
this.pageContext.setAttribute(is, new Boolean(isSuper), getScope());
return isSuper;
}
public void release(){ super.release(); }
private Object getBean(String beanName){
return WebApplicationContextUtils.getWebApplicationContext(pageContext.getServletContext()).getBean(beanName);
}
public String getManagerId() {
return managerId;
}
public void setManagerId(String managerId) {
this.managerId = managerId;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getUserType() {
return userType;
}
public void setUserType(String userType) {
this.userType = userType;
}
public String getIs() {
return is;
}
public void setIs(String is) {
this.is = is;
}
}
tld定义：
[html]
view plaincopy
<tag>
<name>isSuperUser</name>
<tag-class>com.njupt.webapp.tags.IsSuperUserTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<name>userId</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>userType</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>is</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>scope</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
<!-- 如果该用户是公司超级用户则将此菜单显示出来 -->
<gauge:isSuperUser var="info" is="isSuper" userId="${me.id }" userType="Company" >
<div iconCls="icon-password" title="超级用户修改本公司用户密码...." id="updateCompanyUserPassword">修改员工密码</div>
</gauge:isSuperUser>
<?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>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>name</short-name>
<uri>http://www.yuqiaotech.com/name</uri>
<description>name标签库</description>
<tag>
<name>getName</name>
<tag-class>com.yuqiaotech.pms.webapp.tags.getName</tag-class>
<attribute>
<name>userName</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
</tag>
</taglib>
2.我们现在开始实现标签的getName方法。新建一个包com.yuqiaotech.pms.webapp.tags，该包下有两个文件getName.java和PmsTag.java
getName.java
package com.yuqiaotech.pms.webapp.tags;
import javax.servlet.jsp.JspException;
public class getName extends PmsTag{
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getScope() {
return scope;
}
public void setScope(String scope) {
this.scope = scope;
}
private String scope;
public int doStartTag() throws JspException {
//将值直接进行赋值
String myName=userName+"------通过标签获取的数据";
setAttribute(var,this,pageContext,scope,myName);
return super.doStartTag();
}
}
PmsTag.java注意PmsTag继承了struts自定义标签库TagSupport
package com.yuqiaotech.pms.webapp.tags;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
public class PmsTag extends TagSupport{
protected String var;
public static void setAttribute(String attrName,TagSupport tag,PageContext pageContext,String scope,Object obj){
if (scope != null) {
if (scope.equals("page")) {
pageContext.setAttribute(attrName, obj);
} else if (scope.equals("request"<
1334e
span>)) {
pageContext.getRequest().setAttribute(attrName, obj);
} else if (scope.equals("session")) {
pageContext.getSession().setAttribute(attrName, obj);
} else if (scope.equals("application")) {
pageContext.getServletContext().setAttribute(attrName, obj);
} else {
throw new RuntimeException("Attribute 'scope' must be: page, request, session or application :"+scope);
}
}else{
pageContext.getRequest().setAttribute(attrName, obj);
}
}
public String getVar() {
return var;
}
public void setVar(String var) {
this.var = var;
}
}
4.书写一个jsp页面注意在querybooks.jsp添加的，该工程可以参看我的文章：eclipse中新建struts工程http://blog.csdn.net/b10090120/article/details/8045271
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<span style="color:#ff0000;"><%@ taglib uri="http://www.yuqiaotech.com/name" prefix="name" %></span>
<html>
<head>
<title>查询图书信息</title>
</head>
<body>
<span style="color:#ff0000;"><name:getName userName="沈维海" var="myName"></name:getName></span>
${myName }
<s:form action="query">
<s:textfield label="书名" name="name" />
<s:submit value="查询"/>
</s:form>
</body>
</html><span style="color:#ff0000;">
</span>
5.运行效果如下：
<c:if test=""> dosometing.... </c:if>
标签实现：判断当前用户是否是超级用户，如果是超级用户，就执行标签体，如果不是则不执行
[java]
view plaincopy
package com.njupt.webapp.tags;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* 是否执行标签体,同时设置变量可使用范围 （默认:pageContext） 参考： jstl:core:if实现原理
* */
public abstract class AuthorityBaseTag extends TagSupport {
private boolean result; /* 是否执行 */
private String var;
private int scope; /* 结果保存范围 */
protected abstract boolean condition() throws JspTagException, JspException;
public AuthorityBaseTag() {
init();
}
public int doStartTag() throws JspException {
this.result = condition();
if (this.result) {
return 1;
}
return 0;
}
public void release() {
super.release();
init();
}
public void setVar(String var) {
this.var = var;
}
public String getVar() {
return this.var;
}
public void setScope(String scope) {
if (scope.equalsIgnoreCase("page"))
this.scope = 1;
else if (scope.equalsIgnoreCase("request"))
this.scope = 2;
else if (scope.equalsIgnoreCase("session"))
this.scope = 3;
else if (scope.equalsIgnoreCase("application"))
this.scope = 4;
}
public int getScope() {
return this.scope;
}
private void init() {
this.result = false;
this.scope = 1;
}
}
[java]
view plaincopy
package com.njupt.webapp.tags;
import javax.servlet.jsp.JspException;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.njupt.dao.Constants;
import com.njupt.dao.UniversalManager;
import com.njupt.model.ClientUser;
import com.njupt.model.CompanyUser;
import com.njupt.utils.TagUtils;
public class IsSuperUserTag extends AuthorityBaseTag{
protected String managerId = "manager";
protected Long userId;
protected String userType;
protected String is;
protected boolean condition() throws JspException
{
Long _userId = (Long)TagUtils.evaluate("userId", userId+"", Long.class, this, pageContext);
String _userType = (String)TagUtils.evaluate("userType", userType, String.class, this, pageContext);
UniversalManager manager = (UniversalManager)getBean(managerId);
boolean isSuper = false;
if(Constants.COMPANY_USER_TYPE.equals(_userType)){
CompanyUser cu = (CompanyUser)manager.queryUniqueResult("from CompanyUser where id=?", new Object[]{_userId});
isSuper = cu.getIsSuperUser();
}
else if(Constants.CLIENT_USER_TYPE.equals(_userType)){
ClientUser cu = (ClientUser)manager.queryUniqueResult("from ClientUser where id=?", new Object[]{_userId});
isSuper = cu.getIsSuperUser();
}
if (getVar() != null)
this.pageContext.setAttribute(getVar(), new String(isSuper?"超级用户身份一验证":"没有权限访问"), getScope());
if (is != null)
this.pageContext.setAttribute(is, new Boolean(isSuper), getScope());
return isSuper;
}
public void release(){ super.release(); }
private Object getBean(String beanName){
return WebApplicationContextUtils.getWebApplicationContext(pageContext.getServletContext()).getBean(beanName);
}
public String getManagerId() {
return managerId;
}
public void setManagerId(String managerId) {
this.managerId = managerId;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getUserType() {
return userType;
}
public void setUserType(String userType) {
this.userType = userType;
}
public String getIs() {
return is;
}
public void setIs(String is) {
this.is = is;
}
}
tld定义：
[html]
view plaincopy
<tag>
<name>isSuperUser</name>
<tag-class>com.njupt.webapp.tags.IsSuperUserTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<name>userId</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>userType</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>var</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>is</name>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>scope</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
<!-- 如果该用户是公司超级用户则将此菜单显示出来 -->
<gauge:isSuperUser var="info" is="isSuper" userId="${me.id }" userType="Company" >
<div iconCls="icon-password" title="超级用户修改本公司用户密码...." id="updateCompanyUserPassword">修改员工密码</div>
</gauge:isSuperUser>
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