json simple 实例

最新推荐文章于 2024-06-25 13:34:11 发布

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最新推荐文章于 2024-06-25 13:34:11 发布

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本文链接：https://blog.youkuaiyun.com/proud2005/article/details/8651641

本文介绍了一个Java程序如何从JSON文件中读取数据，并将这些数据映射到自定义Java对象的具体实现过程。通过使用JSON-simple库，程序能够轻松地解析JSON数组中的每个元素，并将其转换为UserBean实例，最终形成一个包含多个用户的列表。

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main类

package com.test.json;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

public class testjson {

	/**
	 * @param args
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws FileNotFoundException {
		// TODO Auto-generated method stub
		File f=new File("E:\\a.txt");
		JSONValue jv=new JSONValue();
		Object o= jv.parse(new InputStreamReader(new FileInputStream(f)));
		JSONArray ja=(JSONArray)o;
		List<UserBean> ubs=new ArrayList<UserBean>();
		for (int i = 0; i < ja.size(); i++) {
			System.out.println(ja.get(i));
			JSONObject jo=(JSONObject) ja.get(i);
			
			UserBean ub=new UserBean();
			ub.setId(Integer.parseInt((String) jo.get("id")));
			ub.setEmail((String) jo.get("email"));
			ub.setPassword((String) jo.get("password"));
			ub.setTel((String) jo.get("tel"));
			ub.setName((String) jo.get("name"));
			
			ubs.add(ub);
			System.out.println(jo.get("id"));
		}
		System.out.println("--------------------------------");
		System.out.println(ubs);
	}

}

userbean.java

package com.test.json;

public class UserBean {
private int id;
private String name;
private String password;
private String tel;
private String email;
public String getTel() {
	return tel;
}
public void setTel(String tel) {
	this.tel = tel;
}
public String getEmail() {
	return email;
}
public void setEmail(String email) {
	this.email = email;
}
public int getId() {
	return id;
}
public void setId(int id) {
	this.id = id;
}
public String getName() {
	return name;
}
public void setName(String name) {
	this.name = name;
}
public String getPassword() {
	return password;
}
public void setPassword(String password) {
	this.password = password;
}
@Override
public String toString() {
	return "{\"id\":\"" + id + "\", \"name\":\"" + name + "\", \"password\":\""
			+ password + "\", \"tel\":\"" + tel + "\", \"email\":\"" + email
			+ "\"}";
}

}

aa.txt


[{"id":"1", "name":"t", "password":"t", "tel":"", "email":""}, {"id":"2", "name":"ttt", "password":"tttt", "tel":"", "email":""}, {"id":"3", "name":"ttttt", "password":"ttttt", "tel":"", "email":""}, {"id":"4", "name":"tttt", "password":"tttt", "tel":"", "email":""}, {"id":"5", "name":"aa", "password":"aa", "tel":"", "email":""}, {"id":"6", "name":"aaaa", "password":"aa", "tel":"aaa", "email":"aaa"}, {"id":"7", "name":"tttttttttttttt", "password":"ttt", "tel":"ttttt", "email":"ttttt"}, {"id":"8", "name":"tttttttttttttt", "password":"ffff", "tel":"dddd", "email":"dddd"}, {"id":"9", "name":"bbbb", "password":"bbbb", "tel":"", "email":""}, {"id":"10", "name":"cc", "password":"cc", "tel":"", "email":""}, {"id":"11", "name":"b", "password":"b", "tel":"", "email":""}, {"id":"12", "name":"bbb", "password":"bbb", "tel":"", "email":""}, {"id":"13", "name":"a", "password":"a", "tel":"", "email":""}]