first posted about error messages
java.lang.NullPointerException
lee.LoginAction.execute(LoginAction.java:36)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
I think the problem is that the Action .
package lee;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* Created with IntelliJ IDEA.
* User: ssj
* Date: 13-9-17
* Time: 下午2:21
* To change this template use File | Settings | File Templates.
*/
public class LoginAction extends ActionSupport {
private String username;
private String password;
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;
}
@Override
public String execute() throws Exception {
if (getUsername().equals("ssj")&&getPassword().equals("ssj"))
{
ActionContext.getContext().getSession()
.put("user",getUsername());
return SUCCESS;
}
else
return ERROR;
}
}
then struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.custom.i18n.resources" value="mess"></constant>
<constant name="struts.i18n.encoding" value="UTF-8"></constant>
<package name="lee" extends="struts-default">
<action name="login" class="lee.LoginAction">
<result name="input">/login.jsp</result>
<result name="error">/error.jsp</result>
<result name="success">/welcome.jsp</result>
</action>
</package>
</struts>
novice, we helped to see,
------ Solution - -------------------------------------------
getUsername this without take it to the data . Jsp your data inside the front desk did not spread to the background , you debug facie it.
------ Solution ---------------------------------------- ----
userName or password is empty, the data does not pass over ? , As well as I remember this place
"ssj". equals (userName)) && "ssj". equals (passWord)
------ For reference only ----------- ----------------------------
<%@ page pageEncoding="UTF-8" contentType="text/html; charset=utf-8" %>
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title><s:text name="loginPage"></s:text></title>
</head>
<body>
<s:form action="login">
<s:textfield name="username" key="user"></s:textfield>
<s:textfield name="password" key="pass"></s:textfield>
<s:submit key="login"></s:submit>
</s:form>
</body>
</html>
This is my login page , and you see what the problem
------ For reference only --------------------- ------------------
<%@ page pageEncoding="UTF-8" contentType="text/html; charset=utf-8" %>
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title><s:text name="loginPage"></s:text></title>
</head>
<body>
<s:form action="login">
<s:textfield name="username" key="user"></s:textfield>
<s:textfield name="password" key="pass"></s:textfield>
<s:submit key="login"></s:submit>
</s:form>
</body>
</html>
This is my login page , and you see what the problem
user and pass which is defined in mess.properties
loginPage = \u767b\u5f55\u9875\u9762
errorPage = \u9519\u8bef\u9875\u9762
succPage = \u6210\u529f\u9875\u9762
failTips = \u5bf9\u4e0d\u8d77\uff0c\u4f60\u4e0d\u80fd\u767b\u5f55\uff01
succTips = \u6b22\u8fce\uff0c{0},\u4f60\u5df2\u7ecf\u767b\u5f55
user = \u7528\u6237\u540d
pass = \u5bc6\u7801
login = \u767b\u5f55
------ For reference only ----------------------------------- ----
do this what is the use ?
------ For reference only -------------------------------------- -
you look at your final jsp generated html is not username, password. / . You debug configurations
------ For reference only ----------------------------------- ----
do this what is the use ? with your wording , getUserName.equals (userName). If getUserName is empty how to do, directly reported to the null pointer exception , but with no reported upstairs null pointer exception
------ For reference only ------------- --------------------------
find the problem , I wrote in Struts.xml inside the URL is login.jsp, results visit when an address is http://localhost:8080/login.action or http://localhost:8080/login. Being misled by the pictures on the book . After the visit the address is http://localhost:8080/login.action
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