基于常用json框架介绍和Jackson返回结果处理方式
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json框架介绍，Jackson返回结果处理
介绍常用json框架和注解的使用，自定义返回json结构和格式
1、常用框架 阿里 fastjson,谷歌gson等
JavaBean序列化为Json，性能：Jackson > FastJson > Gson > Json-lib 同个结构
Jackson、FastJson、Gson类库各有优点，各有自己的专长
空间换时间，时间换空间
2、jackson处理相关自动
- 指定字段不返回：@JsonIgnore
- 指定日期格式：@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8")
- 空字段不返回：@JsonInclude(Include.NON_NUll)
- 指定别名：@JsonProperty
实体类代码如下：
public class rData {
@JsonIgnore
private String code;
@JsonProperty(value = "agenum")
private int age;
@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8")
private Date createDate;
@JsonInclude(JsonInclude.Include.NON_NULL)
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public rData(String code, int age) {
this.code = code;
this.age = age;
}
public rData(String code, int age, Date createDate, String name) {
this.code = code;
this.age = age;
this.createDate = createDate;
this.name = name;
}
}测试类代码：
@RestController
public class HttpController {
@GetMapping("/testjson")
public Object param6(){
return new rData("jackson",1,new Date(),"lion");
}
}
结果：
{"createDate":"2018-09-18 09:36:31","name":"lion","agenum":1}
code被忽略了，所以不显示；age被别名代替"agenum"
使用jackson返回json数据
1、SpringMVC如何返回json数据
1.1、添加jar包
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.5</version>
</dependency>1.2、配置spring文件，添加mvc命名空间和约束等
xmlns:mvc="http://www.springframework.org/schema/mvc"
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
<mvc:annotation-driven/>1.3、方法上添加@ResponseBody
@ResponseBody2、例子
2.1、配置pom.xml
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring的核心工具包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!--在基础IOC功能上提供扩展服务，还提供许多企业级服务的支持，有邮件服务、任务调度、远程访问、缓存以及多种视图层框架的支持-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring IOC的基础实现，包含访问配置文件、创建和管理bean等 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring context的扩展支持，用于MVC方面 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring表达式语言 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!--springAop开发必须加入的包-->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!--jackson返回json-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.5</version>
</dependency>
</dependencies>2.2、配置spring.xml
<?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:p="http://www.springframework.org/schema/p"
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.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--扫描controller-->
<context:component-scan base-package="com"></context:component-scan>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--jsp所在位置-->
<property name="prefix" value="/"></property>
<!--jsp文件后缀名-->
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven /> <!--注解驱动-->
</beans>2.3、配置web.xml
<!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>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>springMvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--加载spring配置文件，原来是通过 ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springMvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--处理post乱码-->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>2.4、添加User实体类
package com.fan.entity;
import java.util.Arrays;
import java.util.Date;
public class User {
private String username;
private String password;
private int[] box;
private Date date;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int[] getBox() {
return box;
}
public void setBox(int[] box) {
this.box = box;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
@Override
public String toString() {
return "User{" +
"username='" + username + '\'' +
", password='" + password + '\'' +
", box=" + Arrays.toString(box) +
", date=" + date +
'}';
}
}2.5、 TestJsonController测试类
@Controller
public class TestJsonController {
//http://localhost:8080/testjson1
@RequestMapping("/testjson1")
@ResponseBody //返回json字符串注解
public User test(){
User user=new User();
user.setUsername("malijuan");
user.setPassword("123");
user.setBox(new int[]{1,2,3});
user.setDate(new Date());
return user;
}
//http://localhost:8080/testjson2
@RequestMapping("/testjson2")
@ResponseBody //返回json字符串注解
public List test2(){
User user=new User();
List list=new ArrayList();
for(int i=0;i<5;i++){
user.setUsername("malijuan");
user.setPassword("123");
user.setBox(new int[]{1,2,3});
user.setDate(new Date());
list.add(user);
}
return list;
}
}
2.6、启动tomcat测试
测试1
测试2
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
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