1、依賴的包

根據(jù)：http://json-lib.sourceforge.net/ 可見json-lib使用需要依賴一下包：

?

下載地址：http://download.csdn.net/download/zfxinli/2117292? 或百度盤：http://pan.baidu.com/s/1hq5kGQC

非常有用的參考：

（1）json在線轉(zhuǎn)換器：http://json.parser.online.fr/

（2）json介紹：http://www.json.org/json-zh.html

2、普通JavaBean

（1）基本JavaBean

public class User {private String username;private String password;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;} }

（2）轉(zhuǎn)化成JSONArray

User user = new User(); user.setUsername("lp"); user.setPassword("1234"); JSONArray json = JSONArray.fromObject(user); System.out.println(json); //結(jié)果：[{"password":"1234","username":"lp"}]

（3）轉(zhuǎn)化成JSONObject

User user = new User(); user.setUsername("lp"); user.setPassword("1234"); JSONObject json = JSONObject.fromObject(user); System.out.println(json); //結(jié)果;{"password":"1234","username":"lp"}

?

3、List<User>

（1）轉(zhuǎn)化成JSONArray

List<User>users = new ArrayList<>(); User user = new User(); user.setUsername("lp"); user.setPassword("1234"); User userSecond = new User(); userSecond.setUsername("ch"); userSecond.setPassword("4567"); users.add(user); users.add(userSecond); JSONArray json = JSONArray.fromObject(users); System.out.println(json); //結(jié)果：[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}]

（2）轉(zhuǎn)化成JSONObject

不可以直接通過JSONObject jsonObj = JSONObject.fromObject(users);進(jìn)行

可以通過如下方式：

JSONObject json = new JSONObject(); json.put("users", users); json.put("userSecond", userSecond); System.out.println(json); //結(jié)果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"userSecond":{"password":"4567","username":"ch"}}

??

4、Map

（1）轉(zhuǎn)化成JSONArray

Map<String, Object>map = new HashMap<String, Object>(); map.put("users", users); map.put("user", user); JSONArray json = JSONArray.fromObject(map); System.out.println(json); //結(jié)果：[{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}}]

（2）轉(zhuǎn)化成JSONObject

Map<String, Object>map = new HashMap<String, Object>(); map.put("users", users); map.put("user", user); JSONObject json = JSONObject.fromObject(map); System.out.println(json); //結(jié)果：{"users":[{"password":"1234","username":"lp"},{"password":"4567","username":"ch"}],"user":{"password":"1234","username":"lp"}} 來源：http://blog.sina.com.cn/s/blog_a15aa56901017i2x.html

轉(zhuǎn)載于:https://www.cnblogs.com/lpshou/p/3821207.html

總結(jié)

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