通过fastjson实现各种格式与json之间的转换

package cn.wang; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.TypeReference; import cn.wang.bean.User; public class JsonUtils { /** * 通过fastjson实现JavaBean与json格式之间的数据转换 * @param user */ public void setJavaBeanToJson(User user){ //将javaBean对象转换为json对象 String jsonObj = JSON.toJSONString(user); System.out.println(jsonObj); //将json对象转化为javaBean对象 User newUser = JSON.parseObject(jsonObj, User.class); System.out.println(newUser.getName()); } /** * 通过fastjson实现List<JavaBean>与json格式之间的数据转换 * @param user */ public void setListJavaBeanToJson(User user1, User user2){ List<User> list = new ArrayList<User>(); list.add(user1); list.add(user2); //将javaBean对象转换为json对象 String jsonObj = JSON.toJSONString(list); System.out.println(jsonObj); //将json对象转化为javaBean对象 List<User> newList = JSON.parseArray(jsonObj, User.class); User newUser1 = newList.get(0); User newUser2 = newList.get(1); System.out.println(newUser1.getName()); System.out.println(newUser2.getName()); } /** * 通过fastjson实现字符串与json格式之间的数据转换 */ public void setStringToJson(){ String name1 = "liushishi"; String name2 = "liuyifei"; String name3 = "jiangyan"; List<String> list = new ArrayList<String>(); list.add(name1); list.add(name2); list.add(name3); //将字符串格式转换为json格式 String jsonObj = JSON.toJSONString(list); System.out.println(jsonObj); //将sjon格式转换成字符串格式 List<String> list2 = JSON.parseObject(jsonObj, new TypeReference<List<String>>(){}); System.out.println(list2.get(0)); System.out.println(list2.get(1)); } /** * 通过fastjson实现List<Map>与json格式之间的数据转换 */ public void setListMapToJson(User user1, User user2){ Map<String, User> map = new HashMap<String, User>(); map.put("user1", user1); map.put("user2", user2); //将list的map对象转换为json对象 String jsonObj = JSON.toJSONString(map); System.out.println(jsonObj); //将json对象转换额外list的map对象 Map<String, User> map2 = JSON.parseObject(jsonObj, new TypeReference<Map<String, User>>(){}); User newUser1 = map2.get("user1"); User newUser2 = map2.get("user2"); System.out.println(newUser1.getName()); System.out.println(newUser2.getName()); } /** * @param args */ public static void main(String[] args) { User user = new User(); user.setName("liushishi"); user.setSex("woman"); user.setOld(28); User user2 = new User(); user2.setName("huge"); user2.setSex("man"); user2.setOld(32); JsonUtils jsonUtil = new JsonUtils(); jsonUtil.setListMapToJson(user, user2); } }