JSON格式的数据传递是最常用的方法之一，以下列出了常用的几种形态以及与Javabean之间的转换：
String json1="{'name':'zhangsan','age':23,'interests':[{'interest':'篮球','colors':['绿色','黄色']},{'interest':'足球','colors':['红色','蓝色']}]}";
String json2="[{'name':'zhangsan'},{'name':'lisi'},{'name':'王五'}]";
String json3="{'1':{'name':'zhangsan'},'3':{'name':'lisi'},'4':{'name':'wangwu'}}";//map
String json4="{'name':'zhangsan','age':23}";
首先，此处的转化依赖两个JAR包
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.json/json --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20170516</version> </dependency>
其次，封装的Javabean代码如下
import java.util.List;
public class UserBean {
private String name;
private Integer age;
private List<InterestBean> interests;
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 List<InterestBean> getInterests() {
return interests;
}
public void setInterests(List<InterestBean> interests) {
this.interests = interests;
}
class InterestBean{
private String interest;
private List<String> colors;
public String getInterest() {
return interest;
}
public void setInterest(String interest) {
this.interest = interest;
}
public List<String> getColors() {
return colors;
}
public void setColors(List<String> colors) {
this.colors = colors;
}
}
}
1、普通的json4格式的JSON解析：
public void testParseJson(){
JSONObject jsonObj = new JSONObject(json4);
String name = jsonObj.getString("name");
int age = jsonObj.getInt("age");
System.out.println(name);
System.out.println(age);
UserBean user = new UserBean();
user.setAge(age);
user.setName(name);
}
2、数组形式的JSON解析以及GSON解析：
public void testJsonArray(){
JSONArray jsonArray = new JSONArray(json2);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObj = jsonArray.getJSONObject(i);
String name = jsonObj.getString("name");
System.out.println(name);
}
}
/**
* 解析json数组
*/
public void testParseListJson(){
Gson gson = new Gson();
Type type = new TypeToken<List<UserBean>>(){}.getType();
List<UserBean> users = gson.fromJson(json2, type);
for(UserBean user:users){
System.out.println(user.getName());
}
}
3、内嵌JSON形式的JSON与GSON解析：
/**
* 内嵌JSON解析
*/
public void testParseJson1(){
JSONObject rootJson = new JSONObject(json1);
JSONArray jsonInterestArray = rootJson.getJSONArray("interests");
for (int i = 0; i < jsonInterestArray.length(); i++) {
JSONObject interestJsonObj = jsonInterestArray.getJSONObject(i);
String interest = interestJsonObj.getString("interest");
System.out.println(interest);
Object obj = interestJsonObj.get("colors");
System.out.println(obj);
}
}
/**
* 内嵌GSON解析
*/
public void testSimpleJson(){
Gson gson = new Gson();
UserBean user = gson.fromJson(json1, UserBean.class);
System.out.println(user.getName());
System.out.println(user.getAge());
System.out.println(user.getInterests().size());
List<InterestBean> list = user.getInterests();
for(InterestBean bean:list) {
System.out.println(bean.getInterest());
List<String> colors = bean.getColors();
for(String color:colors){
System.out.println(color);
}
}
}
4、Map形式的JSON的GSON解析：
/**
* 解析一个map类型的json
*/
public void testParseMapJson(){
Gson gson = new Gson();
Type type = new TypeToken<Map<String,UserBean>>(){}.getType();
Map<String,UserBean> map = gson.fromJson(json3, type);
Set<String> keys = map.keySet();
for(String key:keys){
UserBean bean = map.get(key);
System.out.println(key);
System.out.println(bean.getName());
}
}
5、将一个JavaBean对象封装成JSON格式
/**
* 将一个JavaBean对象封装成JSON格式
*/
public String testJavaBean2Json(){
UserBean userBean = new UserBean();
userBean.setName("zhangsan");
userBean.setAge(33);
List<InterestBean> list = new ArrayList<InterestBean>();
InterestBean bean1 = new UserBean().new InterestBean();
bean1.setInterest("篮球1");
InterestBean bean2 = new UserBean().new InterestBean();
bean2.setInterest("篮球2");
list.add(bean1);
list.add(bean2);
userBean.setInterests(list);
//将User Bean转换成Json
Gson gson = new Gson();
String jsonStr = gson.toJson(userBean);
System.out.println(jsonStr);
return jsonStr;
}
}
仅供参考，如有雷同，纯属巧合^_^
以上这篇详谈JSON与Javabean转换的几种形式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
