<jsp:getProperty>获取javaBean属性的值为空？
在TestBooDBean2.jsp中通过setProperty设置bean0的属性值为aaa,为何getProperty获取的值为null?
代码入下：
TestBookDBean2.jsp:
<%@ page contentType= "text/html; charset=GBK " %>
<%@ page import= "java.util.*,bookstore.*; " %>
<html>
<head>
<title>
TestBookDBean2
</title>
</head>
<body bgcolor= "#ffffff ">
<jsp:useBean id= "book0 " scope= "session " class= "bookstore.BookBean "/>
<jsp:setProperty name= "book0 " property= "bookcocern " value= "aaa " />
<P> bookcocern的值为： <jsp:getProperty name= "book0 " property= "bookcocern "/>
</p>
</body>
</html>
BookBean.java:
package bookstore;
public class BookBean
{
private int id;
private String title;
private String author;
private String bookcocern;
private String publish_date;
private float price;
private int amount;
private String remark;
public BookBean()
{
}
public BookBean (int id,String title,String author,String boobkcocern,String publish_date,float price,int amount,String remark)
{
this.id=id;
this.title=title;
this.author=author;
this.bookcocern=bookcocern;
this.publish_date=publish_date;
this.price=price;
this.amount=amount;
this.remark=remark;
}
public int getId()
{
return id;
}
public String getTitle()
{
return title;
}
public String getAuthor()
{
return author;
}
public String getBookcocern()
{
return bookcocern;
}
public String getPublish_date()
{
return publish_date;
}
public float getPrice()
{
return price;
}
public int getAmount()
{
return amount;
}
public String getRemark()
{
return remark;
}
public void setId(int id)
{
this.id=id;
}
public void setTitle(String title)
{
this.title=title;
}
public void setAuthor(String author)
{
this.author=author;
}
public void setBookcocern(String bookconcern)
{
this.bookcocern=bookcocern;
}
public void setPublish_date(String publish_date)
{
this.publish_date=publish_date;
}
public void setPrice(int price)
{
this.price=price;
}
/* public static void main(String args[])
{
BookBean b1=new BookBean(1, "rrr ", "ccc ", "ddd ", "2005-3-5 ",258,58, "fff ");
System.out.println(b1.getAmount());
System.out.println(b1.getPrice());
}*/
}
[解决办法]
我把你的代码精简了一下.如下所示.没有问题.你去测试一下,是不是还其它的错误 .
<%@ page contentType= "text/html; charset=GBK " %>
<html>
<head>
<title>
TestBookDBean2
</title>
</head>
<body bgcolor= "#ffffff ">
<jsp:useBean id= "book0 " scope= "session " class= "com.bookstore.BookBean "/>
<jsp:setProperty name= "book0 " property= "bookcocern " value= "aaa " />
<P> bookcocern的值为： <jsp:getProperty name= "book0 " property= "bookcocern "/> </p>
</body>
</html>
package com.bookstore;
public class BookBean {
private String bookcocern;
public String getBookcocern() {
return bookcocern;
}
public void setBookcocern(String bookcocern) {
this.bookcocern = bookcocern;
}
}
[解决办法]
这两句 <jsp:useBean id= "book0 " scope= "session " class= "bookstore.BookBean "/>
<jsp:setProperty name= "book0 " property= "bookcocern " value= "aaa " />
是不是应该写成
<jsp:useBean id= "book0 " scope= "session " class= "bookstore.BookBean ">
<jsp:setProperty name= "book0 " property= "bookcocern " value= "aaa " />
</jsp:useBean>
[解决办法]
lz将javabean代码修改如下：（lz需要知道对一个javabean的要求）
package bookstore;
public class BookBean {
private int id;
private String title;
private String author;
private String bookcocern;
private String publish_date;
private float price;
private int amount;
private String remark;
public BookBean() {
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getBookcocern() {
return bookcocern;
}
public void setBookcocern(String bookcocern) {
this.bookcocern = bookcocern;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public String getPublish_date() {
return publish_date;
}
public void setPublish_date(String publish_date) {
this.publish_date = publish_date;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
