JSON字符串数组转java对象三种方式
JSON字符串转java对象如下代码，下面我给了三种方式：阿里巴巴的fastjson、谷歌的gson和jackson。
下面的参数是接口方给我提供现有的参数，可以换成你们需要的。
1、实体类package com.example.demo.pojo;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import javax.persistence.*;
@Table(name = "jackson")
@Entity
@JsonIgnoreProperties(ignoreUnknown = true) // jackson使用的注解，没有会报com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field
public class JsonPojo {
// `Col_Key` int(50)
@Id
@JsonProperty(value = "Col_Key") // jackson使用@JsonProperty，fastjson、gson使用@SerializedName
private String colKey;
// `Region` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Region", nullable = false)
@JsonProperty(value = "Region") // value要转对象的值务必要与json字符串中字段对应
private String region;
// `Region_Name` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Region_Name", nullable = false)
@JsonProperty(value = "Region_Name")
private String regionName;
// `ProductLine` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "product_line", nullable = false)
@JsonProperty(value = "ProductLine")
private String productLine;
// `WorkCenter_Code` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "work_center_code", nullable = false)
@JsonProperty(value = "WorkCenter_Code")
private String workcenterCode;
// `WorkCenter_Name` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "work_center_name", nullable = false)
@JsonProperty(value = "WorkCenter_Name")
private String workcenterName;
// `Plan_ID` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Plan_ID", nullable = false)
@JsonProperty(value = "Plan_ID")
private String planId;
// `Operation_Name` varchar(64)
@Basic // 与数据库映射关系
@Column(name = "Operation_Name", nullable = false)
@JsonProperty(value = "Operation_Name")
private String operationName;
// `StartTime` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "start_time", nullable = false)
@JsonProperty(value = "StartTime")
private String startTime;
// `EndTime` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "end_time", nullable = false)
@JsonProperty(value = "EndTime")
private String endTime;
// `Report_Person` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Report_Person", nullable = false)
@JsonProperty(value = "Report_Person")
private String reportPerson;
// `Report_Person_Name` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Report_Person_Name", nullable = false)
@JsonProperty(value = "Report_Person_Name")
private String reportPersonName;
// `Report_Person_End` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Report_Person_End", nullable = false)
@JsonProperty(value = "Report_Person_End")
private String reportPersonEnd;
// `Report_Person_End_Name` varchar(50)
@Basic // 与数据库映射关系
@Column(name = "Report_Person_End_Name", nullable = false)
@JsonProperty(value = "Report_Person_End_Name")
private String reportPersonEndName;
// `Link`
@Basic // 与数据库映射关系
@Column(name = "Link", nullable = false)
@JsonProperty(value = "Link")
private String link;
public String getColKey() {
return colKey;
}
public void setColKey(String colKey) {
this.colKey = colKey;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
public String getRegionName() {
return regionName;
}
public void setRegionName(String regionName) {
this.regionName = regionName;
}
public String getProductLine() {
return productLine;
}
public void setProductLine(String productLine) {
this.productLine = productLine;
}
public String getWorkcenterCode() {
return workcenterCode;
}
public void setWorkcenterCode(String workcenterCode) {
this.workcenterCode = workcenterCode;
}
public String getWorkcenterName() {
return workcenterName;
}
public void setWorkcenterName(String workcenterName) {
this.workcenterName = workcenterName;
}
public String getPlanId() {
return planId;
}
public void setPlanId(String planId) {
this.planId = planId;
}
public String getOperationName() {
return operationName;
}
public void setOperationName(String operationName) {
this.operationName = operationName;
}
public String getStartTime() {
return startTime;
}
public void setStartTime(String startTime) {
this.startTime = startTime;
}
public String getEndTime() {
return endTime;
}
public void setEndTime(String endTime) {
this.endTime = endTime;
}
public String getReportPerson() {
return reportPerson;
}
public void setReportPerson(String reportPerson) {
this.reportPerson = reportPerson;
}
public String getReportPersonName() {
return reportPersonName;
}
public void setReportPersonName(String reportPersonName) {
this.reportPersonName = reportPersonName;
}
public String getReportPersonEnd() {
return reportPersonEnd;
}
public void setReportPersonEnd(String reportPersonEnd) {
this.reportPersonEnd = reportPersonEnd;
}
public String getReportPersonEndName() {
return reportPersonEndName;
}
public void setReportPersonEndName(String reportPersonEndName) {
this.reportPersonEndName = reportPersonEndName;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
@Override
public String toString() {
return "JsonPojo{" +
"colKey='" + colKey + '\'' +
", region='" + region + '\'' +
", regionName='" + regionName + '\'' +
", productLine='" + productLine + '\'' +
", workcenterCode='" + workcenterCode + '\'' +
", workcenterName='" + workcenterName + '\'' +
", planId='" + planId + '\'' +
", operationName='" + operationName + '\'' +
", startTime='" + startTime + '\'' +
", endTime='" + endTime + '\'' +
", reportPerson='" + reportPerson + '\'' +
", reportPersonName='" + reportPersonName + '\'' +
", reportPersonEnd='" + reportPersonEnd + '\'' +
", reportPersonEndName='" + reportPersonEndName + '\'' +
", link='" + link + '\'' +
'}';
}
}
2、测试类
package com.example.demo.controller;
import com.alibaba.fastjson.JSON;
import com.example.demo.pojo.JsonPojo;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.util.List;
public class JsonStringList {
String jsonListStr = "[{\"Region\":\"AC2_1\",\"Region_Name\":\"WXAC总装车间ESC\",\"ProductLine\":\"ZX\",\"WorkCenter_Code\":\"CK01\",\"WorkCenter_Name\":\"仓库备料\",\"Plan_ID\":null,\"Operation_Name\":\"成品下线-PRO\",\"StartTime\":null,\"EndTime\":null,\"Report_Person\":null,\"Report_Person_Name\":null,\"Report_Person_End\":null,\"Report_Person_End_Name\":null,\"Link\":\"\",\"Col_Key\":\"CK01\"},{\"Region\":\"AC2_1\",\"Region_Name\":\"WXAC总装车间ESC\",\"ProductLine\":\"Z1\",\"WorkCenter_Code\":\"CS01\",\"WorkCenter_Name\":\"总_功能测试1\",\"Plan_ID\":null,\"Operation_Name\":null,\"StartTime\":null,\"EndTime\":null,\"Report_Person\":null,\"Report_Person_Name\":null,\"Report_Person_End\":null,\"Report_Person_End_Name\":null,\"Link\":\"\",\"Col_Key\":\"CS01\"}]";
// 方式一：通过jackson，将json字符串数组转java对象（声明：这里不用在pom.xml中引入依赖是因为spring-boot-starter-web底层已经集成了jackson）
public String jacksonMethod() {
try {
ObjectMapper mapper = new ObjectMapper();
// 可以代替实体类@JsonIgnoreProperties(ignoreUnknown = true)
//mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
List lendReco = mapper.readValue(jsonListStr,new TypeReference>() { });
for (int i = 0;i < lendReco.size();i++){
JsonPojo jsonPojo = lendReco.get(i);
System.out.println(jsonPojo.toString());
}
}catch (Exception e){
e.printStackTrace();
}
return "success";
}
// 方式二：通过阿里巴巴的fastjson，将json字符串数组转java对象
public String alibabaMethod(){
List jacksonList = (List) JSON.parseArray(jsonListStr, JsonPojo.class);
for (JsonPojo jsonPojo : jacksonList) {
System.out.println(jsonPojo.toString());
}
return "success";
}
// 方式三：通过谷歌的Gson，将json字符串数组转java对象
public String gsonMethod(){
Gson gson = new Gson();
List jsonPojoList = gson.fromJson(jsonListStr,new TypeToken>(){}.getType());
for (JsonPojo jsonPojo : jsonPojoList) {
System.out.println(jsonPojo.toString());
}
return "success";
}
public static void main(String[] args) {
JsonStringList jsonStringList = new JsonStringList();
// 方式一:jackson
System.out.println(jsonStringList.jacksonMethod());
// 方式二:fastjson
//System.out.println(jsonStringList.alibabaMethod());
// 方式三:gson
//System.out.println(jsonStringList.gsonMethod());
}
}
3、以上我是使用jackson进行的测试，另外两种方式我都注释了，大家可以自己尝试，但是要注意以下几点
①、导包：
springboot项目中spring-boot-starter-web自动集成了jackson所需要的所有jar包，在pom.xml中无需自行添加依赖。只需
添加fastjson依赖：
com.alibaba fastjson 1.2.51
添加gson依赖：
com.google.code.gson gson 2.6.2
②、fastjson和gson方式相同
将实体类中的@JsonProperty变成@SerializedName以及去掉类上的@JsonIgnoreProperties(ignoreUnknown = true)或者测试类中所使用到的 mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)，这两种方式只针对jackson使用，并且只使用其中一个就能解决报错：com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field的问题。
③、以上已经全部测试过，亲测可用。
④、需要pom.xml的朋友可以到我的百度云下载
链接：https://pan.baidu.com/s/1W4rj1UH6nBTAgc9jMMZviQ
提取码：rr2n