spring4之搭建restful风格的web服务

spring4之搭建restful风格的web服务

通过spring mvc搭建一个提供Restful API的web服务。

准备工作

• 下载并安装Eclipse ee版本(4.5.2)
• 下载并安装Tomcat 8.0

• 下载spring framework 4.3.3

  http://repo.spring.io/release/org/springframework/spring/4.3.3.RELEASE/

• 下载commons-logging-1.2.jar

• 下载jackson的三个jar包

  jackson-annotations-2.7.0.jar

  jackson-core-2.7.5.jar

  jackson-databind-2.7.5.jar

Eclipse添加Tomcat

解压tomcat

进入Eclipse首选项，在Server-Runtime Environments添加刚解压的tomcat

创建web工程

1. 通过Eclipse创建Dynamic Web Project

   工程名：sh

   target runtime选择Apache Tomcat v8.0

   勾选自动生成web.xml

2. 配置lib

   拷贝spring framework相关jar包、jackson三个jar包、commons-logging到WEB-ING/lib下

3. 配置web.xml

   添加spring 调度servlet

   <servlet>
   <servlet-name>springmvcservlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
   <load-on-startup>1load-on-startup>
   servlet>
   <servlet-mapping>
   <servlet-name>springmvcservlet-name>
   <url-pattern>/url-pattern>
   servlet-mapping>

   添加encodingFilter

    <filter>
       <filter-name>encodingFilterfilter-name>
       <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
       <init-param>
           <param-name>encodingparam-name>
           <param-value>UTF-8param-value>
       init-param>
       <init-param>
           <param-name>forceEncodingparam-name>
           <param-value>trueparam-value>
       init-param>
   filter>
   <filter-mapping>
       <filter-name>encodingFilterfilter-name>
       <url-pattern>/*url-pattern>
   filter-mapping>

4. 配置springmvc-servlet.xml

   在WEB-INF下新建springmvc-servlet.xml，添加如下配置：

   指定spring在哪个报下扫描controller组件

   <context:component-scan base-package="sh.controller" />

   指定jsp路径（该配置和restful没有直接联系属于mvc常规配置）

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

   指定contoller输出转换器

       <bean id="stringConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
       <property name="supportedMediaTypes">
           <list>
               <value>text/plain;charset=UTF-8value>
           list>
       property>
   bean>
   <bean id="jsonConverter"
       class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">bean>
   <bean
       class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
       <property name="messageConverters">
           <list>
               <ref bean="stringConverter"/>
               <ref bean="jsonConverter" />
           list>
       property>
    bean>

5. 编写restful api
   创建包sh.controller放置控制器
   创建包sh.vo放置前端数据对象

   在sh.vo下创建简单的Bean Person.java，用于测试java对象与json间的自动转换

   public class Person {
   private String name;
   private int age;
   public void setName(String name){
       this.name = name;
   }
   public String getName(){
       return this.name;
   }
   public void setAge(int age){
       this.age = age;
   }
   public int getAge(){
       return this.age;
   }
   }

   在sh.controller下创建restful的控制器。方法参数加上RequestBody注解才能自动将json格式的数据转为输入对象，ResponseBody注解用来控制返回结果作为输出内容。

   @Controller
   public class HelloController {  
   @RequestMapping(value = "/person", method = RequestMethod.POST)
   public @ResponseBody
   Person addPerson(@RequestBody Person person) {
       return person;
   }
   @RequestMapping(value = "/person", method = RequestMethod.GET)
   public @ResponseBody
   List getAllPerson() {
       List list= new ArrayList();
       Person p = new Person();
       p.setAge(1);
       p.setName("rbg");
       list.add(p);
       return list;
   }
   }