Map,HashMap组装Json数据,jackson简单的入门和解析Json例子
package com.ljl.org.domain;import java.io.File;import java.util.HashMap;import java.util.Map;import org.codehaus.jackson.JsonFactory;import org.codehaus.jackson.JsonParser;import org.codehaus.jackson.JsonToken;import org.codehaus.jackson.map.ObjectMapper;import com.google.gson.Gson;import com.ljl.org.entity.Info;import com.ljl.org.entity.User;/** *@Author:liangjilong *@Date:2013-8-13 *@Email:jilongliang@sina.com *@Version:Version1.0 *@CopyRight:liangjilong *@Description:http://wiki.fasterxml.com/JacksonInFiveMinutes#Full_Data_Binding_.28POJO.29_Example * *=====================================*=====================================*☆★★建议解析json的有:*1)GSON (gson-2.2.4.jar)*2)json-lib-2.2.3-jdk15.jar--*☆不建议使用的:*JackSON比较扯淡(毛线)*需要的jar* http://download.csdn.net/detail/jilongliang/5789041*jackson-all-1.6.2.jar*jackson-core-asl-1.6.2.jar*jackson-mapper-asl-1.6.2.jar*jakarta-oro.jar*=====================================*===================================== */public class Jackson1 { private static ObjectMapper mapper = new ObjectMapper(); public static void main(String[] args) throws Exception { jackSon1(); jackSon2(); } /** * 简单的JackSon测试,对比一下，不知道谁抄谁的!Gson和Json-lib-2.2.3-jdk15也有很多相似的 * 使用者两个技术的人都知道、、、、 * =================================================== * Gson创建一个JsonParser* JsonParser parser = new JsonParser();* JsonElement jsonEl = parser.parse(json);* ===================================================* JackSon 创建一个JsonParser* JsonFactory f = new JsonFactory();//实例JSON工程对象* JsonParser jp = f.createJsonParser(json);* =================================================== */ public static void jackSon1()throws Exception{ String json = "[{"userName": "liangjilong","address":"广东阳春"},{"userName": "liangjilong","address": "广东阳春"}]"; JsonFactory f = new JsonFactory();//实例JSON工程对象 JsonParser jp = f.createJsonParser(json); jp.nextToken();//下一个JsonToken while (jp.nextToken() == JsonToken.START_OBJECT) { User u = mapper.readValue(jp, User.class);//对象化 System.out.println(u.getUserName()+"\t"+u.getAddress()); } } /** * @throws Exception */ public static void jackSon2()throws Exception{ /** * 组装address对象的数据 */ Map<String, String> address = new HashMap <String, String>(); address.put("province", "广东省"); address.put("city", "广州市"); address.put("district", "天河区"); address.put("street", "棠东"); /** * 组装users对象的数据 */ Map<String, String> users = new HashMap <String, String>(); users.put("userName", "liangjilong"); users.put("age", "25"); users.put("tel", "12396878"); users.put("email", "jilongliang@sina.com"); Map<Object, Object> listsObj = new HashMap <Object, Object>(); listsObj.put("address",address);//address节点 listsObj.put("user",users);//users节点 Object obj=listsObj;//转换成对象 Map<Object, Object> info = new HashMap <Object, Object>(); info.put("info", obj);//json的根节点 //System.out.println(info); /** * 写 */ String path="D:/test/json1.txt"; mapper.writeValue(new File(path), info);//把数据写入本地文件,JackSon会以json格式写入进去的 /** * 读 */ String jsons=info.toString().replace("=", ":"); //用Gson处理/初次使用JackSon找不到处理json数据,由于之前使用Gson就熟悉,就借用一下处理，感觉有点毛线。O(∩_∩)O哈哈~无语. String newJson=new Gson().toJson(info); int start=newJson.indexOf(":")+1; int end=newJson.lastIndexOf("}"); jsons="["+newJson.substring(start, end)+"]";//组装JackSon支持的格式. JsonFactory f = new JsonFactory();//实例JSON工程对象 JsonParser jp = f.createJsonParser(jsons); jp.nextToken();//下一个JsonToken while (jp.nextToken() == JsonToken.START_OBJECT) { Info inf = mapper.readValue(jp, Info.class);//对象化 System.out.println(inf.getAddress().getDistrict());//获取Address对象的值 System.out.println(inf.getUser().getUserName());//获取User的值 } }}
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package com.ljl.org.entity;/** *@Author:liangjilong *@Date:2013-8-13 *@Email:jilongliang@sina.com *@Version:Version1.0 *@CopyRight:liangjilong *@Description: */public class Info {private Address address;private User user;public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}}?
package com.ljl.org.entity;/** *@Author:liangjilong *@Date:2013-8-13 *@Email:jilongliang@sina.com *@Version:Version1.0 *@CopyRight:liangjilong *@Description: */public class Address {private String province;private String city;private String district;private String street;public String getProvince() {return province;}public void setProvince(String province) {this.province = province;}public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getDistrict() {return district;}public void setDistrict(String district) {this.district = district;}public String getStreet() {return street;}public void setStreet(String street) {this.street = street;}}?
package com.ljl.org.entity;/** *@Author:liangjilong *@Date:2013-8-13 *@Email:jilongliang@sina.com *@Version:Version1.0 *@CopyRight:liangjilong *@Description: */public class User {private int Id; private String userName;private String tel;private String address;private String age;private String email;public int getId() {return Id;}public void setId(int id) {Id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getTel() {return tel;}public void setTel(String tel) {this.tel = tel;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}}?
1 楼 strivezsh 2 小时前 还是比较喜欢 把map 和 list封装成jsonobject jsonarray对象的 这种json jar