jackson测试

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.codehaus.jackson.JsonGenerator;

import org.codehaus.jackson.map.DeserializationConfig;

import org.codehaus.jackson.map.ObjectMapper;

import org.codehaus.jackson.map.SerializationConfig;

import org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion;

import org.codehaus.jackson.type.TypeReference;

public class JacksonTest {

public static ObjectMapper getDefaultObjectMapper() {

ObjectMapper mapper =new ObjectMapper();

//设置将对象转换成JSON字符串时候:包含的属性不能为空或"";

//Include.Include.ALWAYS 默认

//Include.NON_DEFAULT 属性为默认值不序列化

//Include.NON_EMPTY 属性为空（""）或者为 NULL 都不序列化

//Include.NON_NULL 属性为NULL 不序列化

mapper.setSerializationInclusion(Inclusion.NON_EMPTY);

//设置将MAP转换为JSON时候只转换值不等于NULL的

mapper.configure(SerializationConfig.Feature.WRITE_NULL_MAP_VALUES,false);

mapper.configure(JsonGenerator.Feature.ESCAPE_NON_ASCII,true);

mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

//设置有属性不能映射成PO时不报错

mapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);

return mapper;

}

public static void main(String[] args) throws Exception{

//准备数据

Name name1 =new Name("zhang","san");

Name name2 =new Name("li","si");

Name name3 =new Name("wang","wu");

Student student1 =new Student(1,name1,"一班",new Date());

Student student2 =new Student(2,name2,"二班",new Date());

Student student3 =new Student(3,name3,"三班",new Date());

List studentList =new ArrayList();

studentList.add(student1);

studentList.add(student2);

studentList.add(student3);

Map studentMap =new HashMap();

studentMap.put("1", student1);

studentMap.put("2", student2);

studentMap.put("3", student3);

Student json2object =null;

List json2list =null;

Map json2map =null;

ObjectMapper mapper = getDefaultObjectMapper();

/* Object --> JSON */

String object4json = mapper.writeValueAsString(student1);

System.out.println("Object ----> JSON");

System.out.println(object4json);