Gson的用法实例

川长思鸟来 2022-05-19 04:50 248阅读 0赞

## JSON字符串解析成对象 ##

*  JSON字符串

{
      "mailNo": "12345678",
      "orgCode": "315005"
    }

*  NameReq 代码

public class NameReq { 
        private String mailNo; //运单号
        private String orgCode; //机构代码
        
    	public String getMailNo() { 
    		return mailNo;
    	}
    	public void setMailNo(String mailNo) { 
    		this.mailNo = mailNo;
    	}
    	public String getOrgCode() { 
    		return orgCode;
    	}
    	public void setOrgCode(String orgCode) { 
    		this.orgCode = orgCode;
    	}
    
    }

*  解析代码

NameReq nameReq = gson.fromJson(body, NameReq.class);

## JSON字符串解析成集合 ##

*  JSON字符串

[{
    	"monthStartDay": "2018-04-01 00:00:00",
    	"monthEndDay": "2018-04-30 23:23:00"
    }, {
    	"monthStartDay": "2018-05-01 00:00:00",
    	"monthEndDay": "2018-05-31 23:23:00"
    }]

*  DispatchParameter代码

public class DispatchParameter implements Serializable { 
    
    	private String sitename;// 网点名称
    	private String username;// 业务员名称
    	private String monthStartDay;// 每月的开始日期
    	private String monthEndDay;// 每月的结束日期
    	
    	public String getSitename() { 
    		return sitename;
    	}
    	public void setSitename(String sitename) { 
    		this.sitename = sitename;
    	}
    	public String getUsername() { 
    		return username;
    	}
    	public void setUsername(String username) { 
    		this.username = username;
    	}
    	public String getMonthStartDay() { 
    		return monthStartDay;
    	}
    	public void setMonthStartDay(String monthStartDay) { 
    		this.monthStartDay = monthStartDay;
    	}
    	public String getMonthEndDay() { 
    		return monthEndDay;
    	}
    	public void setMonthEndDay(String monthEndDay) { 
    		this.monthEndDay = monthEndDay;
    	}
    	public DispatchParameter(String sitename, String username, String monthStartDay, String monthEndDay) { 
    		super();
    		this.sitename = sitename;
    		this.username = username;
    		this.monthStartDay = monthStartDay;
    		this.monthEndDay = monthEndDay;
    	}
    	
    }

*  解析代码

Gson gson = new Gson();
    		
    List<DispatchParameter> reList  = gson.fromJson(monthArray,  
    	new TypeToken<List<DispatchParameter> >(){ }.getType());

## 匿名内部类 ##

概念：即内部类的简化写法
    前提：存在一个类（可以是具体类也可以是抽象类）或接口
    格式：new 父类名或父接口名{可重写的方法}
    本质：创建的是继承了类或实现了接口的子类匿名对象

/** * 定义了一个继承TypeToken的匿名内部类 */
    Type type=new TypeToken<List<Integer>>() { }.getType();

## Maven坐标 ##

<dependency>
    	<groupId>com.google.code.gson</groupId>
    	<artifactId>gson</artifactId>
    	<version>2.8.2</version>
    </dependency>