增加jackson用例
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# Spring-Samples-For-All
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<br/>
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45
third-party frameworks or libraries/jackson-samples/pom.xml
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third-party frameworks or libraries/jackson-samples/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.heibaiying</groupId>
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<artifactId>jackson-samples</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!--jackson 依赖包 -->
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.9.8</version>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.4</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>
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package com.heibaiying.bean;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import java.util.Date;
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/**
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* @author : heibaiying
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*/
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@Data
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@AllArgsConstructor
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@NoArgsConstructor
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public class User {
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private String name;
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private int age;
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private float salary;
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private Date birthday;
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}
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package com.heibaiying.jackson;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.stream.Collectors;
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/**
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* @author : heibaiying
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* @description : jackson 的使用
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*/
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public class JacksonUtils {
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private static ObjectMapper mapper = new ObjectMapper();
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/***
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* spring 对象转换为json
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*/
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public static String objectToJson(Object object) throws JsonProcessingException {
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return mapper.writeValueAsString(object);
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}
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/***
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* spring json 转换为对象
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*/
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public static <T> T jsonToBean(String json, Class<T> valueType) throws IOException {
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return mapper.readValue(json, valueType);
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}
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/***
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* spring json 转换为List
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*/
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public static <T> List<T> jsonToList(String json, Class<T> valueType) throws IOException {
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List<Map<String, Object>> list = mapper.readValue(json, new TypeReference<List<T>>() {
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});
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return list.stream().map(value -> mapToBean(value, valueType)).collect(Collectors.toList());
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}
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/***
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* spring json 转换为Map (map的value为基本类型)
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*/
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public static Map jsonToMap(String json) throws IOException {
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return mapper.readValue(json, Map.class);
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}
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/***
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* spring json 转换为Map (map的value为bean)
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*/
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public static <T> Map<String, T> jsonToMap(String json, Class<T> clazz) throws IOException {
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Map<String, Map<String, Object>> map = mapper.readValue(json,
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new TypeReference<Map<String, T>>() {
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});
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Map<String, T> result = new HashMap<>();
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for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) {
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result.put(entry.getKey(), mapToBean(entry.getValue(), clazz));
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}
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return result;
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}
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/***
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* map 转换为 bean
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*/
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public static <T> T mapToBean(Map map, Class<T> valueType) {
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return mapper.convertValue(map, valueType);
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}
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}
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.heibaiying.bean.User;
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import com.heibaiying.jackson.JacksonUtils;
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import org.junit.Test;
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import java.io.IOException;
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import java.util.*;
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/**
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* @author : heibaiying
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* @description : jackson 测试
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*/
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public class JacksonTests {
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@Test
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public void test() throws IOException {
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}
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}
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