springmvc--处理json

说一下怎么通过springmvc返回json格式的数据，

第一步，首先是导入依赖（jar包）

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>3.8.1</version>
  <scope>test</scope>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>4.3.3.RELEASE</version>
</dependency>

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>4.0.0</version>
  <scope>provided</scope>
</dependency>

<!--json返回json的依赖-->

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.1</version>
</dependency>


<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>2.9.1</version>
</dependency>

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.9.1</version>
</dependency>

2.然后这里是我的实体类：get set方法就不写了

private Date birthday;

private double money;

private String email;

public Person() {
}

3.springmvc配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<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.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">
    <!--配置扫描器-->
    <context:component-scan base-package="com.controller"></context:component-scan>

    <!--视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/"></property>
        <!--后缀-->
        <property name="suffix" value=".jsp"></property>
    </bean>

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


</beans>
4.我的controller类：

//要想返回数据，需要定义一个@ResponseBody
 @ResponseBody
@RequestMapping("getPersons")
public List<Person> getPersons(){
    //这里就定义一些死的数据：
    List<Person> la=new ArrayList<Person>();
    for (int i = 0; i <10 ; i++) {
        la.add(new Person(new Date(),2000,"123@qq.com"));
    }
    //注意：如果你是用类似于easyui这种ui框架来返回得到数据，一般就是返回一个Map集合和总页数的那种格式就ok了。
    // Map<String, Object> map=new HashMap<String, Object>();
    //			map.put("total", 页数);
    //			map.put("rows", 集合名);
    return  la;
}

5.然后我的前台：

<<a href="/getPersons.action">获取数据</a> <br/>

点击这个连接，就会返回一些json的数据格式：

[{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"},{"birthday":1515826972550,"money":2000.0,"email":"123@qq.com"}]