Question

我正在尝试用Spring，Java和Tomcat实现我的第一个REST服务。我的项目的目的是实现一个返回使用JSON格式化的数据的URL。这是我项目的不同元素：

的pom.xml

   <project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    http://maven.apache.org/maven-v4_0_0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.incvision.utils</groupId>
      <artifactId>springexample</artifactId>
      <packaging>war</packaging>
      <version>0.0.1-SNAPSHOT</version>
      <name>springexample Maven Webapp</name>
      <url>http://maven.apache.org</url>
      <properties>
       <springframework.version>4.0.6.RELEASE</springframework.version>
       <jackson.library>2.6.3</jackson.library>
      </properties>
      <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>3.8.1</version>
          <scope>test</scope>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-core</artifactId>
          <version>${springframework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>${springframework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${springframework.version}</version>
        </dependency>
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.1.0</version>
        </dependency>
        <dependency>
          <groupId>javax.servlet.jsp.jstl</groupId>
          <artifactId>javax.servlet.jsp.jstl-api</artifactId>
          <version>1.2.1</version>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
        <dependency>
          <groupId>javax.servlet.jsp.jstl</groupId>
          <artifactId>jstl-api</artifactId>
          <version>1.2</version>
        </dependency>
        <dependency>
          <groupId>org.apache.commons</groupId>
          <artifactId>commons-lang3</artifactId>
          <version>3.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
        <dependency>
          <groupId>commons-lang</groupId>
          <artifactId>commons-lang</artifactId>
          <version>2.6</version>
        </dependency>
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>${jackson.library}</version>
        </dependency>
      </dependencies>
      <build>
        <finalName>springexample</finalName>
        <plugins>
          <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
              <source>1.8</source>
              <target>1.8</target>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </project>

web.xml：

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns="http://java.sun.com/xml/ns/javaee" 
     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
     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>
         Archetype Created Web Application
       </display-name>
       <servlet>
         <servlet-name>
           mvc-dispatcher2
         </servlet-name>
         <servlet-class>
           org.springframework.web.servlet.DispatcherServlet
         </servlet-class>
         <load-on-startup>1</load-on-startup>
       </servlet>
       <servlet-mapping>
         <servlet-name>mvc-dispatcher2</servlet-name>
         <url-pattern>/resthandler/*</url-pattern>
       </servlet-mapping>
    </web-app>

Servlet mvc-dispatcher2 definition =＆gt; mvc-dispatcher2-servlet.xml：

   <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation=" http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-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/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <context:component-scan base- 
                           package="com.incvision.utils.resthandler" />
<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

控制器定义： HelloWorld2Controller.java

    package com.incvision.utils.resthandler;

    import org.springframework.stereotype.Controller;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;

    @Controller
    @RequestMapping("/helloapp")
    public class HelloWorld2Controller {

        @RequestMapping(value = "/hello", method = RequestMethod.GET)
        public String hello(ModelMap model) {
          model.addAttribute("msg", "JCG Hello World!");
          return "helloWorld";
        }

        @RequestMapping(value = "/displaymessage/{msg}", method = RequestMethod.GET)
        public String displayMessage(@PathVariable String msg, ModelMap model) {
            model.addAttribute("msg", msg);
            return "helloWorld";
        }
   }

SaveImageAjaxController.java

    package com.incvision.utils.resthandler;

    import java.io.FileOutputStream;
    import java.util.Base64;

    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;

    import com.incvision.utils.general.AjaxResponseBody;

    @Controller
    @RequestMapping("/webagent")
    public class SaveImageAjaxController {

       @RequestMapping(value = "/saveimage", method = RequestMethod.GET)
       @ResponseBody
       public AjaxResponseBody getSearchResultViaAjax(@RequestBody String imageData) {

         System.out.println("Appel de  SaveImageAjaxController à /webagent/saveimage");

         AjaxResponseBody result = new AjaxResponseBody();

         byte[] data = 
         Base64.getDecoder().decode(imageData.getBytes());

         try (FileOutputStream fos = new FileOutputStream("/Users/pjdoe/Documents/moninamge.png")) {
           fos.write(data);
           fos.close(); 
         } catch(Exception e) {e.printStackTrace();}

        result.setCode("200");
        result.setMsg("L'image a été sauvegardé.");

        return result;
      }
    }

jsp：HelloWorld.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
      "http://www.w3.org/TR/html4/loose.dtd">
    <html>
      <body>
        <h1>Spring 4.0.2 MVC web service</h1>
        <h3>Your Message : ${msg}</h3> 
      </body>
    </html>

我有两项服务。第一个服务显示带参数的hello消息。它映射到网址http://localhost:8080/SpringRestHandler/resthandler/helloapp/hello 第二个服务保存使用ajax上传的图像。它映射在网址http://localhost:8080/SpringRestHandler/resthandler/webagent/saveimage

上

这两个请求检索到404错误。请求由Postman执行。我的实施中有什么问题？非常感谢您的回复。

找不到Java Spring 4 REST服务错误404页面

0 个答案: