基於常用json框架介紹和Jackson返回結果處理方式
阿新 • • 發佈:2021-09-12
目錄
- on框架介紹,Jackson返回結果處理
- 1、常用框架 阿里 fastjson,谷歌gson等
- 2、jackson處理相關自動
- 使用jackson返回json資料
- 1、SpringMVC如何返回json資料
- 2、例子
json框架介紹,Jackson返回結果處理
介紹常用json框架和註解的使用,自定義返回json結構和格式
1、常用框架 阿里 fastjson,谷歌gson等
Bean序列化為Json,效能:Jackson > FastJson > Gson > Json-lib 同個結構
Jackson、FastJson、Gson類庫各有優點,各有自己的專長
空間換時間,時間換空間
2、jackson處理相關自動
- 指定欄位不返回:@JsonIgnore
- 指定日期格式:@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8")
- 空欄位不返回:@JsonInclude(Include.NON_NUll)
- 指定別名:@JsonProperty
實體類程式碼如下:
public class rData { @JsonIgnore private String code; @JsonProperty(value = "agenum") private int age; @JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",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; } }
測試類程式碼:
@RestController public class HttpController { @GetMapping("/testjson") public Object param6(){ return new rData("jackson",1,new Date(),"lion"); } }
結果:
{"createDate":"2018-09-18 09:36:31","name":"lion","agenum":1}
code被忽略了,所以不顯示;age被別名代替"agenum"
使用jackson返回json資料
1、SpringMVC如何返回json資料
1.1、新增jar包
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.5</version> </dependency>
1.2、配置spring檔案,新增mvc名稱空間和約束等
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、方法上新增@ResponseBody
@ResponseBody
2、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>
<!--在基礎IOC功能上提供擴充套件服務,還提供許多企業級服務的支援,有郵件服務、任務排程、遠端訪問、快取以及多種檢視層框架的支援-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring IOC的基礎實現,包含訪問配置檔案、建立和管理bean等 -->
www.cppcns.com <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring context的擴充套件支援,用於MVC方面 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!-- Spring表示式語言 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.0.8.RELEASE</version>
</dependency>
<!--springAop開發必須加入的包-->
<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&lhttp://www.cppcns.comt;/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
客棧 http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--掃描controller-->
<context:component-scan base-package="com"></context:component-scan>
<!--檢視解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--jsp所在位置-->
<property name="prefix" value="/"></property>
<!--jsp檔案字尾名-->
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven /> <!--註解驅動-->
</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> <!--載入spring配置檔案,原來是通過 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> <!--處理post亂碼--> <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、新增User實體類
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測試類
@Controller public class TestJsonController { //http://localhost:8080/testjson1 @RequestMapping("/testjson1") @ResponseBody //返回json字串註解 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字串註解 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[]{1,3}); user.setDate(new Date()); list.add(user); } return list; } }
2.6、啟動tomcat測試
測試1
測試2
以上為個人經驗,希望能給大家一個參考,也希望大家多多支援我們。