Spring MVC Controller正在工作，但没有创建指定的响应URL，它正在从请求映射字符串创建URL

Question

我正在研究基于SpringMVC的网络应用程序。所以我在springmvc中创建了一个项目，并选择了eclipseIDE。Apache tomcat 8服务器和jre1.8，spring包的版本是4.2.5。在我的项目中，我创建了登录，登录后运行良好。我将页面重定向到另一个名为“branchinsert”的jsp。jsp”（login.jsp和branchinsert.jsp来自不同的文件夹）。在Branchinsert中。jsp Spring MVC Controller正在工作，但没有创建指定的响应URL，它是从请求映射字符串创建URL，这意味着如果我给出了下面提到的模式，

@RequestMapping(value="/branchsubmitinsert.travel", method=RequestMethod.POST)
public ModelAndView submitBranchInsert(@ModelAttribute BranchModel branchModel){

    ModelAndView modelAndView = new ModelAndView("/branch/branchinsert");

    return modelAndView;

}

显示url/ProjectName/modules/branch/branchsubmitinsert.jsp的404错误

实际上我期望的网址是/branch/branchinsert.jsp（这是通常会发生的事情），但这里创建了/branch/branchsubmitinsert.jsp url。为什么？？？？

这是我的代码

网络.xml

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns="http://java.sun.com/xml/ns/javaee" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" 
 version="3.0">
<display-name>CalicutTravels</display-name>
   <servlet>
     <servlet-name>spring-dispatcher</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet
      </servlet-class>
  </servlet>
<servlet-mapping>
  <servlet-name>spring-dispatcher</servlet-name>
   <url-pattern>/</url-pattern>
</servlet-mapping>
<listener><listener-class>
    org.springframework.web.context.ContextLoaderListener
</listener-class>

应用程序上下文. xml

<?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context = "http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

      <context:component-scan base-package="com.classes.controller">
          <context:exclude-filter type="annotation"  
                expression="org.springframework.stereotype.Controller"/>
      </context:component-scan>

  </beans>

spring-dispatcher-servlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context = "http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">
  <context:annotation-config />
  <context:component-scan base-package="com.classes.controller">
  </context:component-scan>
  <mvc:annotation-driven/>

   <mvc:resources mapping="/resources/**" location="/resources/" />

   <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/modules/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

    <!-- declare beans -->

      <bean id="userDaoImplementation" 
       class="com.classes.dao.login.UserDaoImplementation" />
      <bean id="userServiceImplementation"

      class="com.classes.service.login.UserServiceImplementation" />

   <!-- declare datasource bean "jdbc:postgresql://hostname:port
   /dbname","username", "password");-->
  <bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   <property name="driverClassName" value="org.postgresql.Driver" />
   <property name="url" value="jdbc:postgresql://localhost:5432
   /db_enterpricer_travel" />
   <property name="username" value="vishnu" />
   <property name="password" value="root" />
  </bean>

  </beans>

branchinsert.jsp的表单字段

 <form action='branchsubmitinsert.travel' id='brach_submit' method='post' >
            <fieldset class="well the-fieldset">
                <legend class="the-legend">  INSERT </legend>

                    <table>
                        <tr>
                            <th> Branch Name :</th>
                            <td> <input type="text" name='branchName' id='branchName' /></td>
                        </tr>
                        <tr>
                          <td colspan="2" align="right"><input type="button" class="btn btn-default" value='INSERT' onclick='return validateBranchInsert()'/></td>
                        </tr>
                    </table>


             </fieldset>
        </form>

控制器类BranchController.java

 package com.classes.controller.branch;

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.portlet.ModelAndView;

 import com.classes.service.branch.BranchModel;


 /**
 * @author vishnu
 *
 */

 @Controller
 @RequestMapping("/branch")
 public class BranchController {

 @RequestMapping(value="/branchinsert.travel", method=RequestMethod.GET)
 public ModelAndView getBranchInsert(){

    ModelAndView modelAndView = new ModelAndView("/branch/branchinsert");
    return modelAndView;

 }

 @RequestMapping(value="/branchupdate.travel", method=RequestMethod.GET)
 public ModelAndView getBranchUpdate(){

    ModelAndView modelAndView = new ModelAndView("/branch/branchupdate");
    return modelAndView;

 }

 @RequestMapping(value="/branchshow.travel", method=RequestMethod.GET)
 public ModelAndView getBranchShow(){

    ModelAndView modelAndView = new ModelAndView("/branch/branchshow");
    return modelAndView;

 }

 @RequestMapping(value="/branchdelete.travel", method=RequestMethod.GET)
 public ModelAndView getBranchDelete(){

    ModelAndView modelAndView = new ModelAndView("/branch/branchdelete");
    return modelAndView;

 }

@RequestMapping(value="/branchsubmitinsert.travel",
method=RequestMethod.POST)
public ModelAndView submitBranchInsert(@ModelAttribute BranchModel 
branchModel){

    ModelAndView modelAndView = new ModelAndView("/branch/branchinsert");
    modelAndView.addObject("branch",branchModel);
    return modelAndView;

}

}

Answer 1

因为您在viewResolver的前缀中提到了modules文件夹，所以它的工作方式是这样的。。

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/modules/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

这意味着return < code >“branch/branch insert”将在< code >/modules/branch/branch insert . jsp 中找到JSP。

如果只使用字符串返回，则意味着它只是从jsp发送请求集的路径。因此，＜code＞viewResolver＜/code＞不会添加前缀文件夹。

但是，如果您使用ModelAndView，则viewResolver将添加前缀和后缀。

Answer 2

我将方法submit的返回类型更改为String，如下所示

 @RequestMapping(value="/branchsubmitinsert.travel", method=RequestMethod.POST)
public String submitBranchInsert(ModelMap model,@ModelAttribute BranchModel branchModel){

    //ModelAndView modelAndView = new ModelAndView("/branch/branchinsert");
    //modelAndView.addObject("branch",branchModel);
    //return modelAndView;
    model.addAttribute("branch", branchModel);
    return "/branch/branchinsert";

}

现在可以了，但为什么我不能在这里使用ModelAndView而不是String中的Model，可能是我对Spring MVC的专家来说听起来很笨。我就想知道什么时候应该用ModelAndView代替String中的Model？我不想单独问这个问题，这就是为什么我用我的答案来问这个问题。有人能帮我吗？