Jackson 对象与json数据互转工具类JacksonUtil

package com.st.json;import java.util.Date;/** * @Description: JSON序列化和反序列化使用的User类 * @author Mr.Li * @date 2018年4月21日 下午10:55:34 */public class User { ???private Integer id; ???private String name; ???private Integer age; ???private Date birthday; ???private String email; ???public Integer getId() { ???????return id; ???} ???public void setId(Integer id) { ???????this.id = id; ???} ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???} ???public Integer getAge() { ???????return age; ???} ???public void setAge(Integer age) { ???????this.age = age; ???} ???public Date getBirthday() { ???????return birthday; ???} ???public void setBirthday(Date birthday) { ???????this.birthday = birthday; ???} ???public String getEmail() { ???????return email; ???} ???public void setEmail(String email) { ???????this.email = email; ???} ???@Override ???public String toString() { ???????return "User [id=" + id + ", name=" + name + ", age=" + age + ", birthday=" + birthday + ", email=" + email ???????????????+ "]"; ???} ???public User(Integer id, String name, Integer age, Date birthday, String email) { ???????super(); ???????this.id = id; ???????this.name = name; ???????this.age = age; ???????this.birthday = birthday; ???????this.email = email; ???} ???public User() { ???????super(); ???????// TODO Auto-generated constructor stub ???}}

package com.st.json;import java.io.IOException;import java.io.StringWriter;import com.fasterxml.jackson.core.JsonFactory;import com.fasterxml.jackson.core.JsonGenerator;import com.fasterxml.jackson.core.JsonParseException;import com.fasterxml.jackson.databind.JsonMappingException;import com.fasterxml.jackson.databind.ObjectMapper;/** ?* @Description: Jackson 对象与json互转工具类 * @author Mr.Li * @date 2018年4月22日 上午12:30:15 ?*/public class JacksonUtil { ???????private static ObjectMapper mapper = new ObjectMapper(); ?????????public static String BeanToJson(Object obj) throws IOException { ???????StringWriter sw = new StringWriter(); ???????JsonGenerator gen = new JsonFactory().createGenerator(sw); ???????mapper.writeValue(gen, obj); ???????gen.close(); ???????return sw.toString(); ???} ???????public static <T> T JsonToBean(String jsonStr, Class<T> objClass) ?????????????throws JsonParseException, JsonMappingException, IOException { ?????????return mapper.readValue(jsonStr, objClass); ?????}}

package com.st.json;import java.io.IOException;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.List;import com.fasterxml.jackson.core.JsonParseException;import com.fasterxml.jackson.databind.JsonMappingException;/** ?* @Description: Jackson 对象与json互转测试 * @author Mr.Li * @date 2018年4月22日 上午12:39:39 ?*/public class JacksonUtilTest { ???????????public static void main(String[] args) throws ParseException, IOException { ???????beanTojack();// ???????jsonTobean(); ???} ???????public static void beanTojack() throws ParseException, IOException { ???????????????User u = new User(); ???????u.setId(1); ???????u.setName("curry"); ???????u.setAge(30); ???????SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); ???????u.setBirthday(dateFormat.parse("1988-9-21")); ???????u.setEmail("138@163.com"); ???????????????User u2 = new User(); ???????u2.setId(2); ???????u2.setName("KD"); ???????u2.setAge(29); ???????u2.setBirthday(dateFormat.parse("1989-9-21")); ???????u2.setEmail("123@qq.com"); ???????????????List<User> users = new ArrayList<>(); ???????users.add(u); ???????users.add(u2); ???????????????//对象转json格式 ???????String beanToJson = JacksonUtil.BeanToJson(users); ???????System.out.println(beanToJson); ???} ???????public static void jsonTobean() throws JsonParseException, JsonMappingException, IOException { ???????String json = " {\"id\":3, \"name\":\"小明\", \"age\":18, \"birthday\":590774400000, \"email\":\"xiaomin@sina.com\"} "; ???????????????User jsonToBean = JacksonUtil.JsonToBean(json, User.class); ???????System.out.println(jsonToBean); ???}}