日期型参数传递和响应json数据

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• 日期类型数据基于系统不同格式也不尽相同
• 2088-08-18
• 2088/08/18
• 08/18/2088
• 接收形参时，根据不同的日期格式设置不同的接收方式
• @DateTimeFormat

- 类型:形参注解 - 位置:SpringMVC控制器方法形参前面 - 作用:设定日期时间型数据格式 - 属性:pattern:日期时间格式字符串

//7.日期参数 @DateTimeFormat 该注解自动会解析处理,会把字符串类型
    @RequestMapping("/date")
    @ResponseBody
    public String dataParam(Date date,@DateTimeFormat(pattern="yyyy-MM-dd") Date date1,@DateTimeFormat(pattern="yyyy-MM-dd hh:mm:ss") Date date2){ 
        System.out.println("参数传递data:"+date);
        System.out.println("参数传递data1:"+date1);
        System.out.println("参数传递data2:"+date2);
        return "'module':'data.....'";
    }

之前：

• @ResponseBody
• 类型:方法注解
• 位置: SpringMIVC控制器方法定义上方
• 作用:设置当前控制器方法响应内容为当前返回值，无需解析

@Controller
@RequestMapping("/book")
public class BookController { 
    @RequestMapping("/save")
    @ResponseBody
    public String save(){ 
        System.out.println("Book save....");
        return "'module':'Book Save'";
    }
}

而现在：

• @ResponseBody

- 类型:方法注解 - 位置: SpringMVC控制器方法定义上方 - 作用:设置当前控制器返回值作为响应体

@RequestMapping("/text")
 @ResponseBody
    public String text(){ 
        System.out.println("响应文本数据");
        return "response text";
    }

案例分析：

1.pom.xml

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

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>SpringMVC-Demo1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.22.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>
     <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.13.3</version>
    </dependency>
  </dependencies>
</project>

2.ServletContainersInitConfig

package com.study.config;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import javax.servlet.Filter;

public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer { 

    @Override
    protected Class<?>[] getRootConfigClasses() { 
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() { 
        return new Class[]{ SpringMvcConfig.class};
    }

    @Override
    protected String[] getServletMappings() { 
        return new String[]{ "/"};
    }
    @Override
    protected Filter[] getServletFilters() { 
        CharacterEncodingFilter filter = new CharacterEncodingFilter();
        filter.setEncoding("UTF-8");
        return new Filter[]{ filter};
    }
}
/* public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer { //加载SpringMVC容器配置 @Override protected WebApplicationContext createServletApplicationContext() { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(SpringMvcConfig.class); return ctx; } //设置哪些请求可以归属SpringMVC处理 @Override protected String[] getServletMappings() { return new String[]{"/"}; } //加载Spring容器配置 @Override protected WebApplicationContext createRootApplicationContext() { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(SpringConfig.class); return ctx; } }*/

3.SpringMvcConfig

package com.study.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan("com.study.controller")
public class SpringMvcConfig { 
}

4.UserController

package com.study.controller;

import com.study.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Arrays;
import java.util.List;

@Controller
public class UserController { 
    //页面跳转
    @RequestMapping("/jump")
    public String show(){ 
        System.out.println("页面跳转");
        return "jump.jsp";
    }
    //响应文本数据
    @RequestMapping("/text")
    @ResponseBody
    public String text(){ 
        System.out.println("响应文本数据");
        return "response text";
    }
    //响应pojo对象
    @RequestMapping("/jsonPojo")
    @ResponseBody
    public User jsonPojo(){ 
        System.out.println("返回json对象数据");
        User user = new User();
        user.setName("小马哥");
        user.setAge(34);
        Address add=new Address();
        add.setProvince("河南");
        add.setCity("商丘");
        user.setAddress(add);
        return user;
        //{"name":"小马哥","age":34,"address":{"province":"河南","city":"商丘"}}
    }
    //响应pojo集合对象
    @RequestMapping("/jsonList")
    @ResponseBody
    public List<User> jsonList(){ 

        User user1 = new User();
        user1.setName("小飞侠");
        user1.setAge(45);
        Address add=new Address();
        add.setProvince("河南");
        add.setCity("商丘");
        user1.setAddress(add);

        User user2 = new User();
        user2.setName("罗西");
        user2.setAge(45);
        Address add1=new Address();
        add1.setProvince("河南");
        add1.setCity("郑州");
        user2.setAddress(add1);

        List<User> list=new ArrayList<>();
        list.add(user1);
        list.add(user2);
        return list;
        //[{"name":"小飞侠","age":45,"address":{"province":"河南","city":"商丘"}},{"name":"罗西","age":45,"address":{"province":"河南","city":"郑州"}}]
    }


}

5.Address

package com.study.domain;

public class Address { 
    private String province;
    private String city;

    public String getProvince() { 
        return province;
    }

    public void setProvince(String province) { 
        this.province = province;
    }

    public String getCity() { 
        return city;
    }

    public void setCity(String city) { 
        this.city = city;
    }

    @Override
    public String toString() { 
        return "Address{" +
                "province='" + province + '\'' +
                ", city='" + city + '\'' +
                '}';
    }
}

6.User

package com.study.domain;

public class User { 
    private String name;
    private int age;

    private Address address;

    public Address getAddress() { 
        return address;
    }

    public void setAddress(Address address) { 
        this.address = address;
    }

    public String getName() { 
        return name;
    }

    public void setName(String name) { 
        this.name = name;
    }

    public int getAge() { 
        return age;
    }

    public void setAge(int age) { 
        this.age = age;
    }

    @Override
    public String toString() { 
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", address=" + address +
                '}';
    }
}