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新增jackson使用用例

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罗祥 2019-01-14 17:58:56 +08:00
parent ce40f51f54
commit af81084ac0
4 changed files with 0 additions and 162 deletions
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45
third-party frameworks or libraries/jackson-samples/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.heibaiying</groupId>
<artifactId>jackson-samples</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!--jackson 依赖包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

25
third-party frameworks or libraries/jackson-samples/src/main/java/com/heibaiying/bean/User.java
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package com.heibaiying.bean;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
/**
* @author : heibaiying
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private String name;
private int age;
private float salary;
private Date birthday;
}

71
third-party frameworks or libraries/jackson-samples/src/main/java/com/heibaiying/jackson/JacksonUtils.java
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package com.heibaiying.jackson;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* @author : heibaiying
* @description : jackson 的使用
*/
public class JacksonUtils {
private static ObjectMapper mapper = new ObjectMapper();
/***
* spring 对象转换为json
*/
public static String objectToJson(Object object) throws JsonProcessingException {
return mapper.writeValueAsString(object);
}
/***
* spring json 转换为对象
*/
public static <T> T jsonToBean(String json, Class<T> valueType) throws IOException {
return mapper.readValue(json, valueType);
}
/***
* spring json 转换为List
*/
public static <T> List<T> jsonToList(String json, Class<T> valueType) throws IOException {
List<Map<String, Object>> list = mapper.readValue(json, new TypeReference<List<T>>() {
});
return list.stream().map(value -> mapToBean(value, valueType)).collect(Collectors.toList());
}
/***
* spring json 转换为Map (map的value为基本类型)
*/
public static Map jsonToMap(String json) throws IOException {
return mapper.readValue(json, Map.class);
}
/***
* spring json 转换为Map (map的value为bean)
*/
public static <T> Map<String, T> jsonToMap(String json, Class<T> clazz) throws IOException {
Map<String, Map<String, Object>> map = mapper.readValue(json,
new TypeReference<Map<String, T>>() {
});
Map<String, T> result = new HashMap<>();
for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) {
result.put(entry.getKey(), mapToBean(entry.getValue(), clazz));
}
return result;
}
/***
* map 转换为 bean
*/
public static <T> T mapToBean(Map map, Class<T> valueType) {
return mapper.convertValue(map, valueType);
}
}

21
third-party frameworks or libraries/jackson-samples/src/test/java/JacksonTests.java
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import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.heibaiying.bean.User;
import com.heibaiying.jackson.JacksonUtils;
import org.junit.Test;
import java.io.IOException;
import java.util.*;
/**
* @author : heibaiying
* @description : jackson 测试
*/
public class JacksonTests {
@Test
public void test() throws IOException {
}
}