fastJson如何序列化一个包含list对象的Map对象，如Map<String,List<T>>类型的对象

利用阿里的json工具还是挺方便的，直接看代码

1、先有一个实体类StudentInfoDto

package com.myapp.dto;


import java.util.Date;


import com.alibaba.fastjson.annotation.JSONField;


public class StudentInfoDto extends Object{
    private Integer studentSn;


    private String studentName;
    
    private String sex;
    
    /**
     * 序列化日期，使之按照指定格式输出，如果不指定，则会输出当前时间戳
     * 比如：2017-08-02 16:50:29.929
     */
    @JSONField(format="yyyy-MM-dd HH:mm:ss.SSS")
    private Date birthday;
    
    public StudentInfoDto(){
    
    }
  public void setBirthday(Date birthday) {
    this.birthday = birthday;
}
    
public Date getBirthday() {
    return birthday;
}
    
    public StudentInfoDto(Integer studentSn,String studentName,String sex,Date birthday){
        super();
        this.studentSn = studentSn;
        this.studentName = studentName;
        this.sex = sex;
        this.birthday = birthday;
    }


public void setSex(String sex) {
    this.sex = sex;
}
public String getSex() {
    return sex;
}
    
public Integer getStudentSn() {
    return studentSn;
}


public void setStudentSn(Integer studentSn) {
    this.studentSn = studentSn;
}


public String getStudentName() {
    return studentName;
}


public void setStudentName(String studentName) {
    this.studentName = studentName;
}
    
}

2、再写一个main类

package com.myapp.core;


import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import com.alibaba.fastjson.JSON;
import com.myapp.dto.StudentInfoDto;
/**
 * 阿里json的学习
 * @author Administrator
 *
 */
public class TestMapToJson {

public static Map<String, List<StudentInfoDto>> getMapListData(){
List<StudentInfoDto> list1 = new ArrayList<StudentInfoDto>();
list1.add(new StudentInfoDto(1, "张三", "男1",new Date()));
list1.add(new StudentInfoDto(2, "李四", "女2",new Date()));
list1.add(new StudentInfoDto(3, "王五", "女3",new Date()));
List<StudentInfoDto> list2 = new ArrayList<StudentInfoDto>();
list2.add(new StudentInfoDto(7, "张七", "男7",new Date()));
list2.add(new StudentInfoDto(8, "陈八", "男8",new Date()));
list2.add(new StudentInfoDto(9, "刘九", "女9",new Date()));
Map<String, List<StudentInfoDto>> map = new HashMap<String,List<StudentInfoDto>>();
map.put("A123", list1);
map.put("B789", list2);
return map;
}

public static void main(String[] args) {
String jsString = JSON.toJSONString(getMapListData());
System.out.println(jsString);
}
}

3、控制台打印

{
    "B789":[
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"男7",
            "studentName":"张七",
            "studentSn":7
        },
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"男8",
            "studentName":"陈八",
            "studentSn":8
        },
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"女9",
            "studentName":"刘九",
            "studentSn":9
        }
    ],
    "A123":[
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"男1",
            "studentName":"张三",
            "studentSn":1
        },
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"女2",
            "studentName":"李四",
            "studentSn":2
        },
        {
            "birthday":"2017-08-02 17:04:36.417",
            "sex":"女3",
            "studentName":"王五",
            "studentSn":3
        }
    ]
}

如此即可