在Spring MVC中处理多个页面 [英] Handling Multiple pages in spring MVC

问题描述

我是SpringMVC的新蜜蜂，并试图在SpringMVC3中实现这个例子。
http：// www。 mkyong.com/spring-mvc/spring-mvc-handling-multipage-forms-with-abstractwizardformcontroller/
当我提交第一个Jsp时，我可以去下一个Jsp，但是在提交第二个Jsp之后用新的Jsp（空值）重定向回第一个Jsp。

项目

  @Id 
 @Column（name =PROJECT_ID）
 @GeneratedValue（strategy = GenerationType.AUTO）
 private int projectId; 
 
 @Column（name =PROJECT_NAME）
 private String projectName; 
 
 @Column（name =LOCATION）
私人字符串位置; 
 
 @Column（name =DESCRIPTION）
私有字符串描述; 
 
 @Column（name =DEV_TYPE）
 private String developmentType; 
  

ProjectService

  public void addProject（Project project）; 
  

ProjectServiceImpl

  @Autowired 
 private ProjectDao projectDao; 
 
 public void addProject（Project project）{
 projectDao.addProject（project）; 
 
  

ProjectDao

  public void addProject（Project project）; 
  

ProjectDaoImpl

  public void addProject（Project project）{
 getCurrentSession（）。save（project）; 
 
 $ / code> 

ProjectController

 @RequestMapping（value =/addProject.htm，method = RequestMethod.GET）
 public ModelAndView reportForm（ModelMap模型，HttpServletRequest请求，
项目项目）{
 model.addAttribute（project，project）; 
 ModelAndView mav = new ModelAndView（add）; 
 return mav; 
} 
 
 @RequestMapping（value =/addProject.htm，method = RequestMethod.POST）
 public ModelAndView addConfirm（@ModelAttribute（project）Project project，
 BindingResult结果，ModelMap模型，SessionStatus状态，HttpServletRequest请求）{
 HttpSession session = request.getSession（）; 
 validator.validateProject（project，result）; 
 if（result.hasErrors（））{
 return new ModelAndView（addProject）; 
} else if（project.getDescription（）== null）{
 //返回将设置字段2的值的表单
返回新的ModelAndView（addProjectExt）; 
} //等等需要设置的所有其他字段... 
 else {
 model.addAttribute（project，project）; 
 projectService.addProject（project）; 
返回redirect：listProject; 
 
 
 $ / code $ / pre 
 $ b $ JSP 
 addProject.jsp 
 < form：form method =POSTmodelAttribute =projectaction =addProject.htm> 
< div class =input> 
 
 < form：input path =projectName/> 
< / div> 
< div class =input> 
 
 < form：input path =location/> 
< / div> 
< / form：form> 
  
 
 
  JSP2 
 addProjectExt.jsp 
 < form：form method =POSTmodelAttribute =projectaction =addProject.htm> 
< div class =input> 
 
 < form：input path =description/> 
< / div> 
< div class =input> 
 
 < form：input path =developmentType/> 
< / div> 
< / form：form> 
  
 
 
解决方案
请使用@SessionAttribute（project / p> 
 
 
并在JSP中使用提交按钮的目标，以便控制器知道并区分下一个按钮和提交按钮。
 
I am new bee to SpringMVC and trying to implement this example in SpringMVC3. 
http://www.mkyong.com/spring-mvc/spring-mvc-handling-multipage-forms-with-abstractwizardformcontroller/
When I submit first Jsp I am able to go to next Jsp but after submitting the second Jsp it is redirecting back to first Jsp with a new Jsp(empty values). Please suggest with comments to make it more clear for me to understand.

Project
  @Id
  @Column(name="PROJECT_ID")
  @GeneratedValue(strategy=GenerationType.AUTO)
  private int projectId;

  @Column(name="PROJECT_NAME")
  private String projectName;

  @Column(name="LOCATION")
  private String location;

  @Column(name="DESCRIPTION")
  private String description;

  @Column(name="DEV_TYPE")
  private String developmentType;
ProjectService
    public void addProject(Project project);
ProjectServiceImpl
   @Autowired
   private ProjectDao projectDao;

    public void addProject(Project project) {
    projectDao.addProject(project);
    }
ProjectDao
   public void addProject(Project project);
ProjectDaoImpl
   public void addProject(Project project) {
     getCurrentSession().save(project);     
    }
ProjectController
    @RequestMapping(value = "/addProject.htm", method = RequestMethod.GET)
    public ModelAndView reportForm(ModelMap model, HttpServletRequest request,
        Project project) {
    model.addAttribute("project", project);
    ModelAndView mav = new ModelAndView("add");
    return mav;
    }

    @RequestMapping(value = "/addProject.htm", method = RequestMethod.POST)
    public ModelAndView addConfirm(@ModelAttribute("project") Project project,
                   BindingResult result, ModelMap model, SessionStatus status, HttpServletRequest request) {
           HttpSession session = request.getSession();
           validator.validateProject(project, result);
                if (result.hasErrors()) {
                      return new ModelAndView("addProject");
                   } else if (project.getDescription() == null) {
                           //return the form that will set field two's value
                           return new ModelAndView("addProjectExt");
                   } //and so on for all the other field that need to be set...
          else{
        model.addAttribute("project", project);
        projectService.addProject(project);
    return "redirect:listProject";
        }
        }
JSP1
addProject.jsp
            <form:form method="POST" modelAttribute="project" action="addProject.htm" >
            <div class="input">

                    <form:label path="projectName" type="text" value="" >Project Name :*</form:label>
                    <form:input path="projectName"/>                
                </div>
            <div class="input">

                    <form:label path="location" type="text" value="" >Location :</form:label>
                    <form:input path="location"/>               
                   </div>
               </form:form>
JSP2
addProjectExt.jsp
                <form:form method="POST" modelAttribute="project" action="addProject.htm" >
              <div class="input">

                    <form:label path="description" type="text" value="" >Description :*</form:label>
                    <form:input path="description"/>                
                </div>
                <div class="input">

                    <form:label path="developmentType" type="text" value="" >Development Type :</form:label>
                    <form:input path="developmentType"/>                
                </div>
              </form:form>

解决方案
Please try with @SessionAttribute("project")

and use targets for submit button in JSPs, so that controller knows and differentiate between next button and submit button.

                        
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