java json 中文转码 java自带的json转换

FastJSON

• FastJson是一个Java库,可以将Java对象转换为JSON格式,当然它也可以将JSON字符串转换为Java对象
• 提供了toJSONString()和parseObject()方法来将Java对象与JSON相互转换,调用toJSONString()方法即可将对象转换成JSON字符串
  parseObject方法则反过来将JSON字符串转换成对象

使用步骤

1. 添加依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
	<dependency>
	    <groupId>com.alibaba</groupId>
	    <artifactId>fastjson</artifactId>
	    <version>1.2.78</version>
	</dependency>

1. 测试

实体类:
	public class Users {
    private int uid; // 用户实体的主键属性
    private String uname; // 用户账号
    private String upassword; // 用户密码
    private String uemail; // 用户邮箱 用于激活使用
    private String usex; // 用户性别
    private int ustatus; // 用户激活状态 0 未激活 1 激活
    private String ucode; // 邮件激活码
    private int urole; // 用户 0 管理员 1
    // JavaBean...
    }

单元测试:
	@Test
    public void testFastJson() {
        Users users = new Users(2022, "coderitl", "coderitl", "[e-mail]", "男", 1, "2022", 2);
        // 将实体类转换为 json 格式
        String strToJsonUser = JSON.toJSONString(users);
        System.out.println(strToJsonUser);
    }

• 输出

Jackson-JSON操作

• Jackson是一个能否将Java对象序列化为JSON字符串,也能够将JSON字符串反序列化为Java对象的框架
• 通过方法readvalue和writeValue实现

使用步骤

1. 添加依赖或者下载对应jar文件

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.13.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.13.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>

2. 使用

@Test
  public void testJackSon() throws JsonProcessingException {
      ObjectMapper mapper = new ObjectMapper();
      Users users = new Users(2022, "coderitl", "coderitl", "[e-mail]", "男", 1, "2022", 2);
      String s = mapper.writeValueAsString("testJackSon: "+users);
      System.out.println(s);
  }

• JSON格式字符串转换为实体类

@Test
    public void testJackSon() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        // JSON 字符串
        String message = "{\n" +
                "\t\"uid\": 2022,\n" +
                "\t\"uname\": \"coderitl\",\n" +
                "\t\"upassword\": \"coderitl\",\n" +
                "\t\"uemail\": \"[e-mail]\",\n" +
                "\t\"usex\": \"男\",\n" +
                "\t\"ustatus\": 1,\n" +
                "\t\"ucode\": \"2022\",\n" +
                "\t\"urole\": 2\n" +
                "}";
        Users users = mapper.readValue(message, Users.class);
        System.out.println(users);
    }

浏览器处理JSON

• 测试

// 对象
const obj = {name: "coder-itl", age: 20, address: "testJson"};
console.log(typeof (obj)); // object
// 将浏览器对象转换为字符串方法
let res = JSON.stringify(obj);
console.log(typeof (res)); // String
// 将字符串转换为 Object
res = JSON.parse(res);
console.log(typeof (res)); // object