新增spring cloud用例

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;
+}

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);
+    }
+}

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 {
+        
+    }
+}