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feature: json的getByPath方法新增更为通用的指定出参类型重载

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This commit is contained in:
TomShiDi 2024-12-08 15:41:43 +08:00
parent fe567de38d
commit 5622f5e7a7
4 changed files with 67 additions and 4 deletions
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26
hutool-json/src/main/java/cn/hutool/json/JSON.java
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@ -97,6 +97,32 @@ public interface JSON extends Cloneable, Serializable, IJSONTypeConverter {
*/
<T> T getByPath(String expression, Class<T> resultType);
/**
* 通过表达式获取JSON中嵌套的对象<br>
* <ol>
* <li>.表达式，可以获取Bean对象中的属性（字段）值或者Map中key对应的值</li>
* <li>[]表达式，可以获取集合等对象中对应index的值</li>
* </ol>
* <p>
* 表达式栗子：
*
* <pre>
* persion
* persion.name
* persons[3]
* person.friends[5].name
* </pre>
* <p>
* 获取表达式对应值后转换为对应类型的值
*
* @param expression 表达式
* @param targetType 返回值类型
* @return 对象
* @see BeanPath#get(Object)
* @since 5.8.34
*/
<T> T getByPath(String expression, TypeReference<T> targetType);
/**
* 格式化打印JSON，缩进为4个空格
*

9
hutool-json/src/main/java/cn/hutool/json/JSONArray.java
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@ -3,6 +3,7 @@ package cn.hutool.json;
import cn.hutool.core.bean.BeanPath;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.Filter;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.lang.Validator;
import cn.hutool.core.lang.mutable.Mutable;
import cn.hutool.core.lang.mutable.MutableObj;
@ -13,6 +14,7 @@ import cn.hutool.json.serialize.JSONWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
@ -195,7 +197,7 @@ public class JSONArray implements JSON, JSONGetter<Integer>, List<Object>, Rando
*/
public String join(String separator) throws JSONException {
return StrJoiner.of(separator)
.append(this, InternalJSONUtil::valueToString).toString();
.append(this, InternalJSONUtil::valueToString).toString();
}
@Override
@ -218,6 +220,11 @@ public class JSONArray implements JSON, JSONGetter<Integer>, List<Object>, Rando
return JSONConverter.jsonConvert(resultType, getByPath(expression), getConfig());
}
@Override
public <T> T getByPath(String expression, TypeReference<T> targetType) {
return JSONConverter.jsonConvert(targetType, getByPath(expression), getConfig());
}
@Override
public void putByPath(String expression, Object value) {
BeanPath.create(expression).set(this, value);

13
hutool-json/src/main/java/cn/hutool/json/JSONObject.java
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@ -3,6 +3,7 @@ package cn.hutool.json;
import cn.hutool.core.bean.BeanPath;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.lang.Filter;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.lang.mutable.MutablePair;
import cn.hutool.core.map.CaseInsensitiveMap;
import cn.hutool.core.map.MapUtil;
@ -14,6 +15,7 @@ import cn.hutool.json.serialize.JSONWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collection;
@ -161,8 +163,8 @@ public class JSONObject extends MapWrapper<String, Object> implements JSON, JSON
@Deprecated
public JSONObject(Object source, boolean ignoreNullValue, boolean isOrder) {
this(source, JSONConfig.create()//
.setIgnoreCase((source instanceof CaseInsensitiveMap))//
.setIgnoreNullValue(ignoreNullValue)
.setIgnoreCase((source instanceof CaseInsensitiveMap))//
.setIgnoreNullValue(ignoreNullValue)
);
}
@ -320,6 +322,11 @@ public class JSONObject extends MapWrapper<String, Object> implements JSON, JSON
return JSONConverter.jsonConvert(resultType, getByPath(expression), getConfig());
}
@Override
public <T> T getByPath(String expression, TypeReference<T> targetType) {
return JSONConverter.jsonConvert(targetType, getByPath(expression), getConfig());
}
@Override
public void putByPath(String expression, Object value) {
BeanPath.create(expression).set(this, value);
@ -561,7 +568,7 @@ public class JSONObject extends MapWrapper<String, Object> implements JSON, JSON
*/
public Writer write(Writer writer, int indentFactor, int indent, Filter<MutablePair<Object, Object>> filter) throws JSONException {
final JSONWriter jsonWriter = JSONWriter.of(writer, indentFactor, indent, config)
.beginObj();
.beginObj();
this.forEach((key, value) -> jsonWriter.writeField(new MutablePair<>(key, value), filter));
jsonWriter.end();
// 此处不关闭Writer，考虑writer后续还需要填内容

23
hutool-json/src/test/java/cn/hutool/json/JSONPathTest.java
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@ -1,8 +1,12 @@
package cn.hutool.json;
import static org.junit.jupiter.api.Assertions.*;
import cn.hutool.core.lang.TypeReference;
import org.junit.jupiter.api.Test;
import java.util.List;
/**
* JSON路径单元测试
*
@ -27,4 +31,23 @@ public class JSONPathTest {
Long accountId = JSONUtil.getByPath(json, "$.accountId", 0L);
assertEquals(111L, accountId.longValue());
}
@Test
public void getByPathTest3(){
String str = "[{'accountId':1},{'accountId':2},{'accountId':3}]";
JSON json = JSONUtil.parse(str);
// 返回指定泛型的对象 List<Long>
List<Long> accountIds = json.getByPath("$.accountId", new TypeReference<List<Long>>() {
});
assertNotNull(accountIds);
assertArrayEquals(new Long[]{1L, 2L, 3L}, accountIds.toArray());
str = "{\"accountInfos\": [{\"accountId\":1},{\"accountId\":2},{\"accountId\":3}]}";
json = JSONUtil.parse(str);
// 返回指定泛型的对象 List<Long>
accountIds = json.getByPath("$.accountInfos.accountId", new TypeReference<List<Long>>() {
});
assertNotNull(accountIds);
assertArrayEquals(new Long[]{1L, 2L, 3L}, accountIds.toArray());
}
}