请问:javabean的一个奇怪的异常
日期：2014-05-18 浏览次数：20822 次
请教:javabean的一个奇怪的错误
test1.jsp
<%@ page language= "java " contentType= "text/html; charset=GB2312 "
pageEncoding= "GB2312 "%>
<html>
<head>
<title> test </title>
<meta http-equiv= "Content-Type " content= "text/html; charset=GB2312 ">
</head>
<body>
<form name= "form1 " action= "test2.jsp " method= "post " >
<p> 姓名：
<input type= "text " name= "name ">
</p>
<p>
<input type= "submit " value= "传送 ">
<input type= "reset " value= "取消 ">
</p>
</form>
</body>
</html>
test2.jsp
<%@ page contentType= "text/html;charset=GB2312 " %>
<%@ taglib prefix= "fmt " uri= "http://java.sun.com/jsp/jstl/fmt " %>
<html>
<head>
<title> CH8 - Introspection.jsp </title>
</head>
<body>
<fmt:requestEncoding value= "GB2312 " />
<jsp:useBean id= "myBean " scope= "page " class= "bamboo.SimpleBean "/>
<jsp:setProperty name= "myBean " property= "* " />
<%String qq=myBean.searchrs();
out.println(qq);%>
</body>
</html>
SimpleBean.java
package bamboo;
import java.io.*;
public class SimpleBean{
public SimpleBean() {
}
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public String searchrs()throws Exception{
String qq= "www ";
if(!name.equals( " ") && name!=null){
qq= "hello world! ";
}
return qq;
}
}
在test1.jsp的输入框中输入任何字后点击 "传送 ",显示 "hello world! ",而如果test1.jsp的输入框中不输入任何字就点击 "传送 ",结果并不是显示 "www ",而是显示有错,提示错误在SimpleBean.java的判断语句,请大家帮忙看一下这个判断语句哪里有错,谢谢!
if(!name.equals( " ") && name!=null){
qq= "hello world! ";
}
------解决方案--------------------
if(name!=null&& !name.equals( " ") ){
qq= "hello world! ";
}
------解决方案--------------------
if(name != null){
qq= "hello world! ";
}
test1.jsp
<%@ page language= "java " contentType= "text/html; charset=GB2312 "
pageEncoding= "GB2312 "%>
<html>
<head>
<title> test </title>
<meta http-equiv= "Content-Type " content= "text/html; charset=GB2312 ">
</head>
<body>
<form name= "form1 " action= "test2.jsp " method= "post " >
<p> 姓名：
<input type= "text " name= "name ">
</p>
<p>
<input type= "submit " value= "传送 ">
<input type= "reset " value= "取消 ">
</p>
</form>
</body>
</html>
test2.jsp
<%@ page contentType= "text/html;charset=GB2312 " %>
<%@ taglib prefix= "fmt " uri= "http://java.sun.com/jsp/jstl/fmt " %>
<html>
<head>
<title> CH8 - Introspection.jsp </title>
</head>
<body>
<fmt:requestEncoding value= "GB2312 " />
<jsp:useBean id= "myBean " scope= "page " class= "bamboo.SimpleBean "/>
<jsp:setProperty name= "myBean " property= "* " />
<%String qq=myBean.searchrs();
out.println(qq);%>
</body>
</html>
SimpleBean.java
package bamboo;
import java.io.*;
public class SimpleBean{
public SimpleBean() {
}
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public String searchrs()throws Exception{
String qq= "www ";
if(!name.equals( " ") && name!=null){
qq= "hello world! ";
}
return qq;
}
}
在test1.jsp的输入框中输入任何字后点击 "传送 ",显示 "hello world! ",而如果test1.jsp的输入框中不输入任何字就点击 "传送 ",结果并不是显示 "www ",而是显示有错,提示错误在SimpleBean.java的判断语句,请大家帮忙看一下这个判断语句哪里有错,谢谢!
if(!name.equals( " ") && name!=null){
qq= "hello world! ";
}
------解决方案--------------------
if(name!=null&& !name.equals( " ") ){
qq= "hello world! ";
}
------解决方案--------------------
if(name != null){
qq= "hello world! ";
}
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