idea+springmvc+maven学习http接口

学习了几种方式。采用@RequestBody注解的方式最简单。

一、通过maven的pom.xml文件导入jackson的包。

<dependency>  <groupId>com.fasterxml.jackson.core</groupId>  <artifactId>jackson-databind</artifactId>  <version>2.7.4</version></dependency><dependency>  <groupId>com.fasterxml.jackson.core</groupId>  <artifactId>jackson-core</artifactId>  <version>2.7.4</version></dependency><dependency>  <groupId>com.fasterxml.jackson.core</groupId>  <artifactId>jackson-annotations</artifactId>  <version>2.7.4</version></dependency>

二、配置servlet.xml文件

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">    <property name="messageConverters">        <list>            <!--json转换器-->            <ref bean="mappingJacksonHttpMessageConverter" />        </list>    </property></bean><bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">    <property name="messageConverters">        <list>            <ref bean="mappingJacksonHttpMessageConverter" />        </list>    </property></bean><bean id="mappingJacksonHttpMessageConverter"      class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">    <property name = "supportedMediaTypes">        <list>            <bean class="org.springframework.http.MediaType">                <constructor-arg index="0" value="text"/>                <constructor-arg index="1" value="plain"/>                <constructor-arg index="2" value="UTF-8"/>            </bean>            <bean class="org.springframework.http.MediaType">                <constructor-arg index="0" value="*"/>                <constructor-arg index="1" value="*"/>                <constructor-arg index="2" value="UTF-8"/>            </bean>            <bean class="org.springframework.http.MediaType">                <constructor-arg index="0" value="text"/>                <constructor-arg index="1" value="*"/>                <constructor-arg index="2" value="UTF-8"/>            </bean>            <bean class="org.springframework.http.MediaType">                <constructor-arg index="0" value="application"/>                <constructor-arg index="1" value="json"/>                <constructor-arg index="2" value="UTF-8"/>            </bean>        </list>    </property></bean>

三、写接口，采用注解的方式

1.请求地址：http://192.168.2.23:8080/addstudent?username=liudehua&age=60

参数username和age要对应。

@RequestMapping(value = "addstudent",produces = "application/json;charset=UTF-8")    @ResponseBody    public  Object addstudent(String username,int age){//        返回数组        List<Student> studentList = new ArrayList<Student>();        Student stu = new Student();        stu.setName(username);        stu.setAge(age);        studentList.add(stu);        stu = new Student();        stu.setName("wushan");        stu.setAge(20);        studentList.add(stu);        Map<String,List<Student>> map = new HashMap<String,List<Student>>();        map.put("studentList",studentList);        return map;    }

2.请求地址：http://192.168.2.23:8080/addstudent?username=liudehua&age=60

//通过HttpServletRequest接收，post方式和get方式都可以。@RequestMapping(value = "addstudent",produces = "application/json;charset=UTF-8")@ResponseBodypublic Object addstudent(HttpServletRequest request) {    String username = request.getParameter("username");    int age = Integer.valueOf(request.getParameter("age"));    Student student = new Student();    student.setName(username);    student.setAge(age);   return student;}

3.请求地址：http://192.168.2.23:8080/addstudent?username=liudehua&age=60

username和age必须和Student的类的成员变量名称完全一致
    //通过一个bean来接收,post方式和get方式都可以@RequestMapping("addstudent")@ResponseBodypublic Object addstudent(Student student) {    Map<String,Object> map = new HashMap<String,Object>();    map.put("student",student);    return map;}

4.

请求地址：http://192.168.2.23:8080/addstudent/liudehua/60

//通过@PathVariable获取路径中的参数@RequestMapping("addstudent/{username}/{age}")@ResponseBodypublic Object addstudent(@PathVariable String username,@PathVariable int age) {    Student student = new Student();    student.setName(username);    student.setAge(age);        return student;}

5.

//用注解@RequestParam绑定请求参数到方法入参@RequestMapping("addstudent")@ResponseBodypublic Object addstudent(@RequestParam("username") String username,@RequestParam("age") int age) {    Student student = new Student();    student.setName(username);    student.setAge(age);   return student;}