struts2输入校验得不出结果求指点

struts2输入校验得不出结果，那你现在出现什么的效果了？

struts2.ValidateTest.execute(ValidateTest.java:13)
看看你这一行的代码。

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输入界面：<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <base href="<%=basePath%>">

  <title>My JSP 'index.jsp' starting page</title>
  
  </head>

  <body>
  <s:form action="testValidate" method="post">
  <s:textfield name="username" label="username"></s:textfield>
  <s:password name="password" label="password"></s:password>
  <s:password name="repassword" label="repassword"></s:password>
  <s:textfield name="age" label="age"></s:textfield>
  <s:textfield name="birthday" label="birthday"></s:textfield>
  <s:textfield name="graduation" label="graduation"></s:textfield>

  <s:submit name="submit"></s:submit>
  <s:reset name="reset"></s:reset>
  </s:form>

  </body>
</html>
action处理代码：
package struts2;import java.util.Calendar;
import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;

public class ValidateTest extends ActionSupport

{
  private String username;
  private String password;
  private String repassword;
  private int age;
  private Date birthday;
  private Date graduation;

  public String getUsername() {
  return username;
  }
  public void setUsername(String username) {
  this.username = username;
  }
  public String getPassword() {
  return password;
  }
  public void setPassword(String password) {
  this.password = password;
  }
  public String getRepassword() {
  return repassword;
  }
  public void setRepassword(String repassword) {
  this.repassword = repassword;
  }
  public int getAge() {
  return age;
  }
  public void setAge(int age) {
  this.age = age;
  }
  public Date getBirthday() {
  return birthday;
  }
  public void setBirthday(Date birthday) {
  this.birthday = birthday;
  }
  public Date getGraduation() {
  return graduation;
  }
  public void setGraduation(Date graduation) {
  this.graduation = graduation;
  }

  public String execute() throws Exception
  {
  return SUCCESS;
  }

  public void validate()
  {
  System.out.println("已经调用了效验方法");
  if(null == username || username.length() <6 || username.length() >10)
  {
  this.addFieldError("username","username needs 6 to 10 chars");
  }
  if(null == password || password.length() <6 || password.length() >10)
  {
  this.addFieldError("password", "password needs 6 to 10 chars");
  }
  if(null == repassword || repassword.length() <6 || repassword.length() >10)
  {
  this.addFieldError("repassword", "repassword needs 6 to 10 chars");
  }
  if( null != password || null !=repassword)
  {
  if( !password.equals(repassword) )
  {
  this.addFieldError("repassword", "two pasword should be same");
  }
  }
  }
  }

struts.xml配置：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="com" extends="struts-default" namespace="/">
<action name="testValidate" class="struts2.ValidateTest">
<result name="input">regist.jsp</result>
<result name="success">success.jsp</result>
</action>
</package></struts>
success.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <base href="<%=basePath%>">

  <title>My JSP 'success.jsp' starting page</title>
    </head>

  <body>
  检验正确 <br>
  </body>
</html>
点击提交时出现错误信息：
type Exception reportmessage  description The server encountered an internal error () that prevented it from fulfilling this request.exception  java.lang.NullPointerException
struts2.ValidateTest.execute(ValidateTest.java:13)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)

NullPointerException o(︶︿︶)o

调试易

struts2输入校验得不出结果求指点

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struts2输入校验得不出结果 求指点

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struts2输入校验得不出结果求指点