我们经常会用到json和oject类型的相互转换，这篇文章记录了通过gson进行object和json的相互转换。

gson 依赖

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<dependency>
    	<groupId>com.google.code.gson</groupId>
    	<artifactId>gson</artifactId>
    	<version>2.6.2</version>
</dependency>

object转换为json

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// 1.新建一个对象
FromMessage fromMessage = new FromMessage();
fromMessage.setContent("test");
fromMessage.setIsRead(Boolean.FALSE);
// 2.将对象转化为json字符串
Gson gson = new Gson();
String jsonString = gson.toJson(fromMessage);
System.out.println(jsonString);			// {"content":"test","isRead":false}

json转化为object

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Gson gson = new Gson();
String jsonString = "{\"content\":\"test\",\"isRead\":false}";
FromMessage fromMessage1 = gson.fromJson(jsonString, FromMessage.class);
System.out.println(fromMessage1);  		//Message{id=null, content='test', title='null', isRead=false, fromDepartment=null, toDepartment=null, firstReadTime=null, firstReadUser=null, createUser=null, createTime=null}

参考文章：
How to convert Java object to JSON string