我是靠谱客的博主 忧伤煎饼，最近开发中收集的这篇文章主要介绍jackson-PropertyNamingStrategy.SNAKE_CASE 遇到的问题与解决方案举例如下情景1情景2情景3情景4-暂时性解决方案情景5-解决方案【推荐】，觉得挺不错的，现在分享给大家，希望可以做个参考。
概述
目录
举例如下
情景1
正常情况下
json字段
目标类
测试用例
输出结果
情景2
json字段-同1
目标类
测试用例-同1
输出结果
测试用例
开启PropertyNamingStrategy.SNAKE_CASE
输出结果
情景3
json字段-同1
目标类
测试用例-同2
输出结果
存在问题
情景4-暂时性解决方案
目标对象
测试用例
输出结果
情景5-解决方案【推荐】
目标对象
测试用例
输出结果
举例如下
json里有命名为home_test的字段需要反序列化
可直接看情景5-解决方案
情景1
正常情况下
json字段
jsonString包含"home_test"字段
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
目标类
注意这里的命名方式，有下划线
package json;
public class Obj {
// 注意这里的命名方式
private String home_test;
public String getHome_test() {
return home_test;
}
public void setHome_test(String home_test) {
this.home_test = home_test;
}
@Override
public String toString() {
return "Obj{" +
"home_test='" + home_test + ''' +
'}';
}
}
测试用例
package json;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
public class Test {
public static void main(String[] args) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
// objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
}
输出结果
Obj{home_test='hm_test_value'}情景2
json字段-同1
目标类
注意这里的命名方式，没有下划线
package json2;
public class Obj {
// 注意这里的命名方式
private String homeTest;
public String getHomeTest() {
return homeTest;
}
public void setHomeTest(String homeTest) {
this.homeTest = homeTest;
}
@Override
public String toString() {
return "Obj{" +
"homeTest='" + homeTest + ''' +
'}';
}
}
测试用例-同1
package json2;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Test {
public static void main(String[] args) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
// objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
}
输出结果
Obj{homeTest='null'}测试用例
开启PropertyNamingStrategy.SNAKE_CASE
// 注意是否开启
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);package json2;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
public class Test {
public static void main(String[] args) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
}
输出结果
Obj{homeTest='hm_test_value'}
情景3
注意！！！！坑快来了
PropertyNamingStrategy.SNAKE_CASE开启后，带来的新问题
json字段-同1
注意“hoMe”字段
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
目标类
增加hoMe属性，注意home的命名方式，与json一致
package json3;
public class Obj {
// 注意这里的命名方式
private String homeTest;
// 注意home的命名方式
private String hoMe;
public String getHomeTest() {
return homeTest;
}
public void setHomeTest(String homeTest) {
this.homeTest = homeTest;
}
public String getHoMe() {
return hoMe;
}
public void setHoMe(String hoMe) {
this.hoMe = hoMe;
}
@Override
public String toString() {
return "Obj{" +
"homeTest='" + homeTest + ''' +
", hoMe='" + hoMe + ''' +
'}';
}
}
测试用例-同2
开启 objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
package json3;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
public class Test {
public static void main(String[] args) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
}
输出结果
Obj{homeTest='hm_test_value', hoMe='null'}
存在问题
开启PropertyNamingStrategy.SNAKE_CASE，解决了home_test转homeTest问题，但是引入了hoMe转hoMe失败问题
情景4-暂时性解决方案
不开启PropertyNamingStrategy.SNAKE_CASE，并解决home_test转homeTest问题
目标对象
只新增了私有的setHome_test方法
package json4;
public class Obj {
// 注意这里的命名方式
private String homeTest;
// 注意home的命名方式
private String hoMe;
public String getHomeTest() {
return homeTest;
}
public void setHomeTest(String homeTest) {
this.homeTest = homeTest;
}
// 新增了私有的setHome_test方法
private void setHome_test(String homeTest) {
this.homeTest = homeTest;
}
public String getHoMe() {
return hoMe;
}
public void setHoMe(String hoMe) {
this.hoMe = hoMe;
}
@Override
public String toString() {
return "Obj{" +
"homeTest='" + homeTest + ''' +
", hoMe='" + hoMe + ''' +
'}';
}
}
测试用例
关闭PropertyNamingStrategy.SNAKE_CASE
package json4;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
public class Test {
public static void main(String[] args) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
// objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
}
输出结果
Obj{homeTest='hm_test_value', hoMe='hm'}
情景5-解决方案【推荐】
开启PropertyNamingStrategy.SNAKE_CASE，并解决转换问题
直接字段映射注解。利用@JsonProperty映射
// 注意这里的命名方式
@JsonProperty(value = "home_test")
private String homeTest;
// 注意这里的命名方式
@JsonProperty(value = "hoMe")
private String hoMe;目标对象
public class Obj {
// 注意这里的命名方式
@JsonProperty(value = "home_test")
private String homeTest;
// 注意home的命名方式
@JsonProperty(value = "hoMe")
private String hoMe;
public String getHomeTest() {
return homeTest;
}
public void setHomeTest(String homeTest) {
this.homeTest = homeTest;
}
public String getHoMe() {
return hoMe;
}
public void setHoMe(String hoMe) {
this.hoMe = hoMe;
}
@Override
public String toString() {
return "Obj{" +
"homeTest='" + homeTest + ''' +
", hoMe='" + hoMe + ''' +
'}';
}
}测试用例
开启PropertyNamingStrategy.SNAKE_CASE
public static void main(String[] args) {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 注意是否开启
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
String newjson1 = "{"biztype":1236,"hometown":"11","hoMe":"hm","home_test":"hm_test_value"}";
Obj obj = objectMapper.readValue(newjson1, Obj.class);
System.out.println(obj);
}
输出结果
Obj{homeTest='hm_test_value', hoMe='hm'}
最后
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