java无法将jsp表单值设置为类变量
当我试图从类中获取在jsp中设置的值时，显示null
在开发模式下观察到以下错误：
ERROR ParametersInterceptor Developer Notification (set struts.devMode to false to disable this message): Unexpected Exception caught setting 'name' on 'class org.ravi.EmployeeAction: Error setting expression 'name' with value 't'
下面是我的各种页面
struts。xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="default" extends="struts-default">
<action name="addEmployeeAction" class="org.ravi.EmployeeAction">
<interceptor-ref name="params" />
<interceptor-ref name="modelDriven"/>
<result name="success">/Add.jsp</result>
</action>
<action name="EmployeeAction" class="org.ravi.EmployeeAction" method="execute">
<interceptor-ref name="params" />
<interceptor-ref name="modelDriven"/>
<result name="success">/index.jsp</result>
</action>
</package>
</struts>
索引。jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" import="java.util.*,java.io.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<s:form action="Add.jsp" name="addForm">
<table border="1" cellpadding="5">
<tr>
<th>Select</th>
<th>EmpID</th>
<th>Name</th>
<th>City</th>
<th>DoB</th>
</tr>
<tr>
<th><input type="radio" name="record"
onClick="radioValidate(this, 'record')" value="%{var}">
</th>
<th><s:property value="empid"/></th>
<th><s:property value="name"/></th>
<th><s:property value="city"/></th>
<th><s:property value="dob"/></th>
</s:form>
</body>
</html>
加上。jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Add New User</h1>
<s:form action="EmployeeAction" >
<s:textfield label="Emp Id" name="empid" />
<s:textfield label="Name" name="name" />
<s:textfield label="City" name="city" />
<s:textfield label="DoB" name="dob" />
<s:submit />
</s:form>
</body>
</html>
雇员行动。爪哇
package org.ravi;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class EmployeeAction extends ActionSupport implements ModelDriven<Employee> {
private static final long serialVersionUID = -8136507522861159378L;
private Employee employee=new Employee();
public Employee getEmployee()
{
return employee;
}
public void setEmployee(Employee employee)
{
this.employee=employee;
}
public String execute() throws Exception
{
return SUCCESS;
}
@Override
public Employee getModel()
{
return employee;
}
}
雇员。爪哇
package org.ravi;
import java.io.Serializable;
public class Employee implements Serializable{
static final long serialVersionUID = 1L;
private String empid;
private String name;
private String city;
private String dob;
public void setempid(String empid) {
this.empid = empid;
}
public void setname(String name) {
this.name = name;
}
public void setcity(String city) {
this.city = city;
}
public void setdob(String dob) {
this.dob = dob;
}
public String getempid() {
return this.empid;
}
public String getname() {
return this.name;
}
public String getcity() {
return this.city;
}
public String getdob() {
return this.dob;
}
}
# 1 楼答案
你犯了几个错误，最糟糕的是
您正在手动生成getter和setter（很多无用的工作），而且您也做得不对：变量名的第一个字母必须大写：
你应该（为了简单和一致性）用一个以上的单词对变量中的每个单词都这样做：
在可能的情况下，你也应该考虑避免冗余。如果类Employee上有一个ID字段，只需调用它id，而不是empId。。。如果它在Emp内部，很明显它是Emp id，而不是其他id。只有当你享受痛苦时才使用
ModelDriven。在其他方面，当你面对一群饥饿的流浪狗时，它就像口袋里的香肠一样有用使用HTML5 DTD
<!DOCTYPE html>如果你针对的是旧浏览器，那么现在就没有必要使用4.01永远不要像在第一个表单中那样直接调用JSP，总是先传递操作
从这个开始。还有很多
必须阅读
# 2 楼答案
您需要正确命名所有这些，即setName（字符串名） setEmpId等也一样。Struts找不到getter/setter，因为它们不遵循命名约定