SpringMVC：JSON形式输出(基于Fastjson)

在Spring3.0中，@ResponseBody标记可以将对象”封装”为JSON形式的数据，并输出，下面的例子中使用的是阿里的Fastjson JSONaz解析工具， 在spring配置文件中加入一些额外的配置。

1.依赖配置

<properties>

    <spring.version>4.1.4.RELEASE</spring.version>

    <fastjson.version>1.2.11</fastjson.version>

    <javax.servlet.version>2.5</javax.servlet.version>

    <jackson.version>1.9.10</jackson.version>

  </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>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-web</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>fastjson</artifactId>

      <version>${fastjson.version}</version>

    </dependency>

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>servlet-api</artifactId>

      <version>${javax.servlet.version}</version>

      <scope>provided</scope>

    </dependency>

  </dependencies>

2.一个POJO，要转换为JSON输出的对象

public class shop {

    private String name;

    private String[] staffName;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String[] getStaffName() {

        return staffName;

    }

    public void setStaffName(String[] staffName) {

        this.staffName = staffName;

    }

}

3.servlet-context.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<!-- 注意！SpringMVC的配置文件使用的是mvc命名空间 -->

<beans:beans xmlns:context="http://www.springframework.org/schema/context"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xmlns:beans="http://www.springframework.org/schema/beans"

             xmlns="http://www.springframework.org/schema/mvc"

             xmlns:task="http://www.springframework.org/schema/task"

             xmlns:mvc="http://www.springframework.org/schema/mvc"

             xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

            http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd

          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">

    <context:annotation-config/>

    <context:component-scan base-package="com.mkyong.common.controller" />

    <annotation-driven>

        <message-converters register-defaults="true">

            <!-- @ResponseBody乱码问题，将StringHttpMessageConverter的默认编码设为UTF-8 -->

            <beans:bean class="org.springframework.http.converter.StringHttpMessageConverter">

                <beans:constructor-arg value="UTF-8"/>

            </beans:bean>

            <!-- 配置Fastjson支持 -->

            <beans:bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">

                <beans:property name="charset" value="UTF-8"/>

                <beans:property name="supportedMediaTypes">

                    <beans:list>

                        <beans:value>application/json</beans:value>

                        <beans:value>text/html;charset=UTF-8</beans:value>

                    </beans:list>

                </beans:property>

                <beans:property name="features">

                    <beans:list>

                        <beans:value>WriteMapNullValue</beans:value>

                        <beans:value>QuoteFieldNames</beans:value>

                        <beans:value>WriteDateUseDateFormat</beans:value>

                        <beans:value>WriteEnumUsingToString</beans:value>

                    </beans:list>

                </beans:property>

            </beans:bean>

        </message-converters>

    </annotation-driven>

    <beans:bean

            class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <beans:property name="prefix" value="/WEB-INF/"/>

        <beans:property name="suffix" value=".jsp"/>

    </beans:bean>

</beans:beans>

4.web.xml文件

<!DOCTYPE web-app PUBLIC

 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>

  <display-name>json output</display-name>

  <servlet>

    <servlet-name>dispatchServlet</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>

      <param-name>contextConfigLocation</param-name>

      <param-value>classpath:servlet-context.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

    <servlet-name>dispatchServlet</servlet-name>

    <url-pattern>/</url-pattern>

  </servlet-mapping>

</web-app>

5.controller类

@Controller

@RequestMapping("/kfc/brands")

public class JSONController {

    @RequestMapping(value = "{name}",method = RequestMethod.GET)

    public @ResponseBody shop getShopInJSON(@PathVariable String name)

    {

        shop sp = new shop();

        sp.setName(name);

        sp.setStaffName(new String[]{"Staffname1","Staffname2"});

        return sp;

    }

    //测试用

    @RequestMapping("")

    public String index()

    {

        return "index";

    }

}

6.测试结果：