java自定义标签代码,Java代码库,德仔网

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【Java】 java自定义标签
作者:BlackPotato / 发布于2015/8/3/ 473
自定义标签，简单的配置下表名，显示的字段名，值字段名，附加条件，即可展现~

	CrmSelectTag.java

	package com.crm.taglib;
	
	import java.util.HashMap;
	import java.util.List;
	
	import javax.servlet.jsp.JspWriter;
	
	import org.apache.commons.lang.StringUtils;
	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;
	import org.springframework.stereotype.Component;
	import org.springframework.web.servlet.tags.RequestContextAwareTag;
	
	import com.crm.common.bo.BOSelect;
	import com.crm.common.util.CrmConst;
	import com.crm.service.base.CommonSVImpl;
	
	@SuppressWarnings("serial")
	@Component("CrmSelectTag")
	public class CrmSelectTag extends RequestContextAwareTag {
	
	 private Log log = LogFactory.getLog(CrmSelectTag.class);
	
	 private String id;
	 private String crmTagCode;
	 private String valueColumn;
	 private String textColumn;
	 private String tableName;
	 private String condition;
	 private String sql;
	 private String width;
	
	 public String getId() {
	 return id;
	 }
	
	 public void setId(String id) {
	 this.id = id;
	 }
	
	 public String getCrmTagCode() {
	 return crmTagCode;
	 }
	
	 public void setCrmTagCode(String crmTagCode) {
	 this.crmTagCode = crmTagCode;
	 }
	
	 public String getValueColumn() {
	 return valueColumn;
	 }
	
	 public void setValueColumn(String valueColumn) {
	 this.valueColumn = valueColumn;
	 }
	
	 public String getTextColumn() {
	 return textColumn;
	 }
	
	 public void setTextColumn(String textColumn) {
	 this.textColumn = textColumn;
	 }
	
	 public String getTableName() {
	 return tableName;
	 }
	
	 public void setTableName(String tableName) {
	 this.tableName = tableName;
	 }
	
	 public String getCondition() {
	 return condition;
	 }
	
	 public void setCondition(String condition) {
	 this.condition = condition;
	 }
	
	 public String getSql() {
	 return sql;
	 }
	
	 public void setSql(String sql) {
	 this.sql = sql;
	 }
	
	 public String getWidth() {
	 return width;
	 }
	
	 public void setWidth(String width) {
	 this.width = width;
	 }
	
	 public String geneSQL() {
	 StringBuilder sql = new StringBuilder();
	 sql.append(" SELECT t.").append(valueColumn).append(" SELECT_VALUE, ");
	 sql.append(" t.").append(textColumn).append(" SELECT_TEXT ");
	 sql.append(" FROM ").append(tableName).append(" t ");
	 sql.append(" where 1=1 ");
	 sql.append(condition);
	 return sql.toString();
	 }
	
	 @Override
	 protected int doStartTagInternal() throws Exception {
	 if(StringUtils.isEmpty(width)) {
	 width = "170";
	 }
	 CommonSVImpl CommonSV = this.getRequestContext().getWebApplicationContext().getBean("CommonSVImpl",CommonSVImpl.class);
	
	 log.info("开始执行【crm:select】标签");
	
	 JspWriter out = pageContext.getOut();
	 try {
	 StringBuffer sb = new StringBuffer();
	 if (CrmConst.crmTag.SELECT_TABLE.equals(crmTagCode)) {
	 List<BOSelect> list = CommonSV.executeNativeSelect(geneSQL(), new HashMap(), BOSelect.class);
	 sb.append("<select id=\""+id+"\" style=\"width: "+width+"px\">");
	 sb.append("<option value=\"-1\">---请选择---</option>");
	 for(BOSelect s : list) {
	 sb.append("<option value=\""+s.getSelectValue()+"\">"+s.getSelectText()+"</option>");
	 }
	 sb.append("</select>");
	
	 }
	 out.write(sb.toString());
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 return 0;
	 }
	}

	

	

	CrmRadioTag.java

	package com.crm.taglib;
	
	import java.util.HashMap;
	import java.util.Map;
	
	import javax.servlet.jsp.JspException;
	import javax.servlet.jsp.JspWriter;
	import javax.servlet.jsp.tagext.TagSupport;
	
	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;
	
	import com.crm.common.util.CrmConst;
	
	@SuppressWarnings("serial")
	public class CrmRadioTag extends TagSupport {
	
	 private Log log = LogFactory.getLog(CrmRadioTag.class);
	
	 private String crmTagCode;
	 private String name;
	
	 public String getCrmTagCode() {
	 return crmTagCode;
	 }
	
	 public void setCrmTagCode(String crmTagCode) {
	 this.crmTagCode = crmTagCode;
	 }
	
	 public String getName() {
	 return name;
	 }
	
	 public void setName(String name) {
	 this.name = name;
	 }
	
	 @Override
	 public int doStartTag() throws JspException {
	 log.info("开始执行标签");
	
	 JspWriter out = pageContext.getOut();
	 try {
	 StringBuffer sb = new StringBuffer();
	 if (CrmConst.crmTag.RADIO_COMMON.equals(crmTagCode)) {
	 Map<String,String> m = new HashMap<String,String>();
	 m.put("0", "否");
	 m.put("1", "是");
	
	 for (String key : m.keySet()) {
	 sb.append(" <input type=\"radio\" name=\"").append(name).append("\"")
	 .append(" value=\"").append(key).append("\"")
	 .append(" \\>").append(m.get(key));
	 }
	
	 //sb.append("<script type=\"text/javascript\">");
	 //sb.append("</script>");
	
	 }
	 out.write(sb.toString());
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 return super.doStartTag();
	 }
	
	 @Override
	 public int doEndTag() throws JspException {
	
	 return super.doEndTag();
	 }
	
	}

	

	

	spring-mvc.xml

	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	 xmlns:context="http://www.springframework.org/schema/context"
	 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
	 xmlns:aop="http://www.springframework.org/schema/aop"
	 xsi:schemaLocation="http://www.springframework.org/schema/beans
	 http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
	 http://www.springframework.org/schema/context
	 http://www.springframework.org/schema/context/spring-context-4.1.xsd
	 http://www.springframework.org/schema/mvc
	 http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
	 http://www.springframework.org/schema/aop
	 http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
	 http://www.springframework.org/schema/tx
	 http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
	 ">
	 <context:component-scan base-package="com.crm.controller" />
	 <mvc:annotation-driven />
	
	 <bean id="crmViewResolver" class="com.crm.resolver.MultViewResolver">
	 <property name="resolvers">
	 <map>
	 <!-- 定义跳转的文件的前后缀 ，视图模式配置 -->
	 <entry key="jsp">
	 <bean id="viewResolver"
	 class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	 <property name="viewClass"
	 value="org.springframework.web.servlet.view.JstlView" />
	 <property name="prefix" value="/WEB-INF/pages/" />
	 <property name="suffix" value=".jsp" />
	 </bean>
	 </entry>
	
	 <entry key="ftl">
	 <bean id="viewResolverFtl"
	 class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
	 <property name="viewClass"
	 value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" />
	 <property name="contentType" value="text/html; charset=utf-8" />
	 <property name="cache" value="false" />
	 <property name="prefix" value="" />
	 <property name="suffix" value=".ftl" />
	 </bean>
	 </entry>
	 </map>
	 </property>
	 </bean>
	
	 <!-- ******************************freeMarker配置【START】****************************** -->
	 <bean id="freemarkerConfig"
	 class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
	 <property name="templateLoaderPath" value="/WEB-INF/ftl/" />
	 <property name="freemarkerVariables">
	 <map>
	 <entry key="xml_escape" value-ref="fmXmlEscape" />
	 </map>
	 </property>
	 <property name="defaultEncoding" value="utf-8" />
	 <property name="freemarkerSettings">
	 <props>
	 <prop key="template_update_delay">3600</prop>
	 </props>
	 </property>
	 </bean>
	 <bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" />
	 <!-- ******************************freeMarker配置【END】****************************** -->
	
	 <mvc:interceptors>
	 <!-- 多个拦截器,顺序执行 -->
	 <mvc:interceptor>
	 <mvc:mapping path="/**" />
	 <mvc:exclude-mapping path="/resource/**" />
	 <bean id="CrmInterceptor" class="com.crm.interceptor.CrmInterceptor">
	 <property name="allowUrls">
	 <list>
	 <value>/crm/</value>
	 <value>/crm/login</value>
	 </list>
	 </property>
	 </bean>
	 </mvc:interceptor>
	 </mvc:interceptors>
	
	 <mvc:resources mapping="/resource/**" location="/resource/" />
	</beans>

	

	

	demo.jsp

	<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
	<%@ taglib prefix ="c" uri="http://java.sun.com/jsp/jstl/core" %>
	<%@ include file="../common/commonHead.jsp"%>
	<%@ taglib prefix="crm" uri="../../tld/crm.tld"%>
	
	<!DOCTYPE html>
	<html lang="zh-CN">
	<head>
	<meta http-equiv="content-type" content="text/html; charset=gbk" />
	<meta name="apple-mobile-web-app-capable" content="yes" />
	<meta name="viewport" content="width=device-width, initial-scale=1" />
	<title>TAG DEMO</title>
	</head>
	<body>
	 <div class="container">
	 <div class="row">
	 <table class="table">
	 <thead>
	 <tr>
	 <th width="50%">API</th>
	 <th width="50%">DEMO</th>
	 </tr>
	
	 <tr>
	 <td>
	 <textarea style="width: 100%">
	 <crm:radio name="aa" crmTagCode="RADIO_COMMON"></crm:radio>
	 </textarea>
	 </td>
	 <td>
	 <crm:radio name="aa" crmTagCode="RADIO_COMMON"></crm:radio>
	 </td>
	 </tr>
	
	 <tr>
	 <td>
	 <textarea style="width: 100%">
	 <crm:radio name="aa" crmTagCode="RADIO_COMMON"></crm:radio>
	 </textarea>
	 </td>
	 <td>
	 <crm:select tableName="CRM_OPERATOR" textColumn="NAME"
	 valueColumn="CODE" crmTagCode="SELECT_TABLE" id="test">
	 </crm:select>
	 </td>
	 </tr>
	
	 </thead>
	 </table>
	 </div>
	 </div>
	</body>
	<script type="text/javascript">
	
	</script>
	</html>
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