spring mvc 返回Json

 

 

1 pom文件中 添加

 

spring 框架的jar 4.1.2 版本

<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>4.1.2.RELEASE</version>

</dependency>

 

jackson json jar 包

<dependency>

<groupId>org.codehaus.jackson</groupId>

<artifactId>jackson-mapper-asl</artifactId>

<version>1.9.2</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl -->

<dependency>

<groupId>org.codehaus.jackson</groupId>

<artifactId>jackson-core-asl</artifactId>

<version>1.9.13</version>

</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-databind</artifactId>

<version>2.9.3</version>

</dependency>

 

springmvc-servlet.xml 配置

好多人说需要加入以下配置，但是我没加，也是运行正常，能返回jason格式的数据

<bean id="mappingJacksonHttpMessageConverter"

class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">

<property name="supportedMediaTypes">

<list>

<value>application/json;charset=UTF-8</value>

</list>

</property>

 

 

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

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

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

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

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

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-4.1.xsd

http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd"

>

 

<!-- scan the package and the sub package -->

<context:component-scan base-package="com.maven01.*"/>

<!-- don't handle the static resource -->

<mvc:default-servlet-handler />

<!-- if you use annotation you must configure following setting -->

<mvc:annotation-driven />

<!-- 对静态资源的处理 ，不需要dispatcher servelet-->

<mvc:resources mapping="/static/**" location="/static/"/>

<!-- configure the InternalResourceViewResolver -->

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"

id="internalResourceViewResolver">

<!-- 前缀 -->

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

<!-- 后缀 -->

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

</bean>

</beans>

 

controller 的代码

package com.maven01.controller;

 

import java.util.ArrayList;

import java.util.List;

 

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

 

import com.maven01.dto.*;

@Controller

@RequestMapping("/mvc")

public class DemoController {

 

@RequestMapping("/index")

public String hello(){

return "index";

}

@RequestMapping(method=RequestMethod.GET, value="/getUser",produces="application/json")

public @ResponseBody List<UserDto> getUser(){

ArrayList<UserDto> resultList=new ArrayList<UserDto>();

for(int i=0;i<100;i++)

{

UserDto user=new UserDto(i,String.format("hbb0b0-%s", i+""));

resultList.add(user);

}

return resultList;

}

}

 

 

运行效果

 

 

 

 

转载于:https://www.cnblogs.com/hbb0b0/p/8288714.html