首頁猿問登錄后頁面跳轉(zhuǎn)問題

登錄后頁面跳轉(zhuǎn)問題

Java

慕先生5417536 2017-06-03 10:48:26

HTTP Status 500 -type?Exception reportmessagedescription?The server encountered an internal error that prevented it from fulfilling this request.exceptionjava.lang.NullPointerException action.UsersAction.validate(UsersAction.java:56) com.opensymphony.xwork2.validator.ValidationInterceptor.doBeforeInvocation(ValidationInterceptor.java:251) com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) 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:245) com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)note?The full stack trace of the root cause is available in the Apache Tomcat/7.0.77 logs.登陸后輸入已有的賬號密碼zhangsan，123456并點擊確定后就報錯500了

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精慕門9254224

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空指針異常

1 反對回復(fù) 2017-06-03

慕的地6079101

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反對回復(fù) 2021-10-16

qq_nullpointere_6

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原圖片貼圖

反對回復(fù) 2017-06-05

慕先生5417536

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錯誤結(jié)果：

UsersAction配置文件如下：

反對回復(fù) 2017-06-03

路人Bing

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沒有UserAction相關(guān)代碼，只能推測：在你邏輯沒問題的情況下看你的配置文件，struts2配置是否有問題，spring的配置文件中跟User相關(guān)的的bean是否已經(jīng)添加

反對回復(fù) 2017-06-03

慕先生5417536
UserAction相關(guān)代碼： package action; import org.apache.struts2.interceptor.validation.SkipValidation; import service.UsersDAO; import service.impl.UsersDAOImpl; import com.opensymphony.xwork2.ModelDriven; import entity.Users; public class UsersAction extends SuperAction implements ModelDriven<Users>{ /** * */ private static final long serialVersionUID = 1L; private Users user = new Users(); //用戶登錄動作 public String login() { UsersDAO udao = new UsersDAOImpl(); if(udao.usersLogin(user)) { //在session中保存登陸成功的用戶名 session.setAttribute("loginUserName", user.getUsername()); return "login_success"; } else { return "login_failure"; } }

回復(fù) 2017-06-03
慕先生5417536
@SkipValidation //用戶注銷方法 public String logout() { if(session.getAttribute("loginUserName")!=null) { session.removeAttribute("loginUserName"); } return "logout_success"; } @Override public void validate() { // TODO Auto-generated method stub //用戶名不能為空 if("".equals(user.getUsername().trim())) { this.addFieldError("usernameError","用戶名不能為空！"); } if(user.getPassword().length()<6) { this.addFieldError("passwordError","密碼長度不少于6位"); } } public Users getModel(){ //TODO Auto-generated method stub return null; } }

回復(fù) 2017-06-03
慕先生5417536
為什么代碼格式這么難看...

回復(fù) 2017-06-03