JavaBean命名规范,不能以一个字母开头bPrivNum,可以bussPrivNum

今天做项目时候遇到个JavaBean的set()、get()方法取值取不到问题！！！！

 

###1.今后注意JavaBean或Model的命名尽量不要使用如下形式：

即：1)首字母别一个小写开头，2)结尾尽量不要加s复数

  private String privNum;//正确
  private String bPrivNum;//错误

  private Double[] selectMoney;//正确
  private Double[] selectMoneys;//错误

 

 

报如下错误：

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception
org.apache.jasper.JasperException: An exception occurred processing JSP page 
/jsp/phone/login/frame/frameLeft.jsp at line 97

94:
95:
96: <c:forEach items="${firstList1}" var="firstMenu">
97: ${firstMenu.bPrivName}
98: </c:forEach>
99: <c:forEach items="${secondList1}" var="secondMenu">
100: ${secondMenu.bPrivName}

 root cause
javax.el.PropertyNotFoundException: Property 'bPrivName' not found on type 
com.hanpeng.base.phone.model.TBussinessPriv
    javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:193)
    javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:170)
    javax.el.BeanELResolver.property(BeanELResolver.java:279)
    javax.el.BeanELResolver.getValue(BeanELResolver.java:60)
    javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)

 ###大概意思为：el表达式没法通过getXXX()找打TbussinessPriv中的bPrivName属性

 

一、总结

总结如下：EL表达式调用BeanUtils.getProperty(bean, name);来获得对象属性，分析源码这个类默认将你javaBean

的属性，首字母大写并且前面加上set、get，例如privNum-->setPrivNum、getPrivNum。

但是如果你属性为bPrivNum-->setBPrivNum、getBPrivNum，你通过EL表达式${test.bPrivNum}就会报错！！！

二、如何避免

1.JavaBean命名时避免出现bPrivNum这样的名字，1)可以为privNum。2)可以为BPrivNum。

public class TBussinessPriv extends BaseModel{

	private String privNum;
	//private String BPrivNum; 也正确
	//private String bPrivNum; 错误

	public String getPrivNum() {
	
		return privNum;
	}

	public void setPrivNum(String privNum) {
	
		this.privNum = privNum;
	} 
}

 

2.非要使用bPrivNum命名，EL表达式得值时，人为改为BPrivNum，不能更JavaBean中的bPrivNum一样

public class TBussinessPriv extends BaseModel{

	private String bPrivNum;

	public String getbPrivNum() {
	
		return bPrivNum;
	}

	public void setbPrivNum(String bPrivNum) {
	
		this.bPrivNum = bPrivNum;
	}
}

 

<c:if test="${firstList!=null}">
<c:forEach items="${firstList}" var="firstMenu">
<h1 id="m${firstMenu.BPrivNum}" 
  onClick="SwitchMenu('sub${firstMenu.BPrivNum}','m${firstMenu.BPrivNum}')" class="menu">
<ol class="left11">
${firstMenu.BPrivName}
</ol>
</h1>
<ul class="submenu" id="sub${firstMenu.BPrivNum}" >
<c:forEach items="${secondList}" var="secondMenu">
<c:if test="${firstMenu.BPrivNum==secondMenu.BMenuId1}">
<li><a href="${secondMenu.BPrivUrl}" target="main">
<span><img src="${secondMenu.BPicUrl}" width="26" height="27" align="middle"/></span>
${secondMenu.BPrivName}</a></li><br/>
</c:if>
</c:forEach>
</ul>
</c:forEach>
</c:if>