Spring MVC 将参数映射到 .jsp 而不是 @RequestMapping

Question

我已经使用 maven 原型创建了一个示例 spring-mvc 应用程序

mvn archetype:generate -D groupId=test.tool -D artifactId=test-D version=0.1-SNAPSHOT -D archetypeArtifactId=spring-mvc-jpa-archetype -D archetypeGroupId=org.fluttercode.knappsack

我一直在尝试从 URL 读取一些参数：

package test.tool.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;


@Controller
@RequestMapping(value = "/testReadRest", method = RequestMethod.GET)
public class TestReadRestController {

private static final Logger logger = LoggerFactory
        .getLogger(TestReadRestController.class);


// No Params
@RequestMapping(method = RequestMethod.GET)
public void getMainModel(Model model) {
    model.addAttribute("varFromClient","[NOT SET]");
    model.addAttribute("tokenFromClient","[NOT SET]");
    return;
}

// http://localhost:8080/test/testReadRest/varPost
// read "varPost"
@RequestMapping(value = "/{varPost}", method = RequestMethod.GET)
public void getVarFromURI(@PathVariable("varPost") String theVar, Model model) {
    model.addAttribute("varFromClient",theVar);
    model.addAttribute("tokenFromClient","[NOT SET]");
    return;
   }
}

但尝试时未读取参数 http://localhost:8080/test/testReadRest/varPost

相反，我收到一个错误：

Problem accessing /soctoolset/WEB-INF/views/testReadRest/varPost.jsp. Reason: NOT_FOUND

有什么建议？

[编辑]

这里是豆子

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"   
    xsi:schemaLocation="
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <!-- Imports user-defined @Controller beans that process client requests -->
    <beans:import resource="controllers.xml" />

</beans:beans>

和控制器.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- Scans within the base package of the application for @Components to 
        configure as beans -->
    <context:component-scan base-package="test.tool" />

    <tx:annotation-driven />
    <mvc:annotation-driven />

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

    <bean id="validator"
        class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

</beans>

Answer 1

我用你使用的原型建立了一个新项目。

您正在void从该@Controller方法返回，因此文档中的这一部分适用：

void如果方法本身处理响应（通过直接编写响应内容，为此目的声明 ServletResponse / HttpServletResponse 类型的参数），或者如果视图名称应该通过RequestToViewNameTranslator隐式确定（不在处理程序中声明响应参数）方法签名）。

因此，视图是根据 path 解析的，在您的情况下是“varPost”或您放在路径末尾的任何内容。由于此默认配置，附加了扩展名“.jsp”：

<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <beans:property name="prefix" value="/WEB-INF/views/" />
    <beans:property name="suffix" value=".jsp" />
</beans:bean>

您可以添加丢失的文件，但我想这不是您想要做的。相反，您可以更改处理程序方法的签名并显式设置视图，如下所示：

@RequestMapping(value = "/{varPost}", method = RequestMethod.GET)
public String getVarFromURI(@PathVariable("varPost") String theVar,
        Model model) {
    model.addAttribute("varFromClient", theVar);
    model.addAttribute("tokenFromClient", "[NOT SET]");
    return "someview";
}

这会导致以下合理的错误：

请求的资源 (/testapp/WEB-INF/views/someview.jsp) 不可用。

现在，您只需要创建该视图。然后您可以使用路径变量而不会干扰视图分辨率。

如果您不想呈现 JSP，您可以先阅读有关“支持的方法返回类型”的文档。如果你想完全自己处理响应，你可以void再次返回并将请求和响应添加为参数。