一、依赖
fastjson依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.56</version> </dependency>
jackson依赖
springMVC默认json解析器就是jackson，如果是springweb项目不用导入
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.7.3</version> </dependency>
二、代码
package xxxx.entity; public class DeliveryMan implements Serializable { private String name; private String phone; private String area; private String officeholding; private String jobnum; private int state; public DeliveryMan() { } public DeliveryMan(String name, String phone, String area, String officeholding, String jobnum, int state) { this.name = name; this.phone = phone; this.area = area; this.officeholding = officeholding; this.jobnum = jobnum; this.state = state; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getArea() { return area; } public void setArea(String area) { this.area = area; } public String getOfficeholding() { return officeholding; } public void setOfficeholding(String officeholding) { this.officeholding = officeholding; } public String getJobnum() { return jobnum; } public void setJobnum(String jobnum) { this.jobnum = jobnum; } public int getState() { return state; } public void setState(int state) { this.state = state; } @Override public String toString() { return "DeliveryMan{" + "name='" + name + '\'' + ", phone='" + phone + '\'' + ", area='" + area + '\'' + ", officeholding='" + officeholding + '\'' + ", jobnum='" + jobnum + '\'' + ", state=" + state + '}'; } }
package xxxx.xxx; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.fasterxml.jackson.databind.ObjectMapper; import com.uublue.food.Application; import com.uublue.food.delivery.entity.DeliveryMan; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.io.IOException; import java.util.ArrayList; @RunWith(SpringRunner.class) @SpringBootTest(classes = Application.class) public class UtilPay { @Test public void jsontostring() throws IOException { ObjectMapper mapper = new ObjectMapper(); DeliveryMan man=new DeliveryMan(); man.setState(1); man.setPhone("1111"); DeliveryMan man2=new DeliveryMan(); man2.setState(2); man2.setPhone("2222"); ArrayList<DeliveryMan> list=new ArrayList<>(); list.add(man); list.add(man2); //list转string String s1 = JSONArray.toJSONString(list); String s2 = mapper.writeValueAsString(list); System.out.println("com.alibaba.fastjson.JSONArray;"); System.out.println(s1); System.out.println("om.fasterxml.jackson.databind.ObjectMapper;"); System.out.println(s2); //string转list java.util.List<DeliveryMan> deliveryManList1= JSON.parseArray(s1, DeliveryMan.class); java.util.List<DeliveryMan> deliveryManList2= mapper.readValue(s2, mapper.getTypeFactory().constructParametricType(ArrayList.class, DeliveryMan.class)); System.out.println("com.alibaba.fastjson.JSONArray"); System.out.println(deliveryManList1.toString()); System.out.println("om.fasterxml.jackson.databind.ObjectMapper"); System.out.println(deliveryManList2.toString()); } }
com.alibaba.fastjson.JSONArray; [{"phone":"1111","state":1,"user_id":0},{"phone":"2222","state":2,"user_id":0}] om.fasterxml.jackson.databind.ObjectMapper; [{"id":null,"name":null,"phone":"1111","area":null,"officeholding":null,"jobnum":null,"state":1,"createtime":null,"updatetime":null,"user_id":0},{"id":null,"name":null,"phone":"2222","area":null,"officeholding":null,"jobnum":null,"state":2,"createtime":null,"updatetime":null,"user_id":0}] com.alibaba.fastjson.JSONArray [DeliveryMan{name='null', phone='1111', area='null', officeholding='null', jobnum='null', state=1, createtime=null, updateTime=null, user_id=0}, DeliveryMan{name='null', phone='2222', area='null', officeholding='null', jobnum='null', state=2, createtime=null, updateTime=null, user_id=0}] om.fasterxml.jackson.databind.ObjectMapper [DeliveryMan{name='null', phone='1111', area='null', officeholding='null', jobnum='null', state=1, createtime=null, updateTime=null, user_id=0}, DeliveryMan{name='null', phone='2222', area='null', officeholding='null', jobnum='null', state=2, createtime=null, updateTime=null, user_id=0}]
三、参考文章
jackson完成json和对象/map/list互转：https://blog.csdn.net/qq_37936542/article/details/79268402
fastjson List<> 转Json , Json 转List<>：https://www.cnblogs.com/xiaohouzai/p/8972286.html
