SpringBoot系列---【get请求如何传递json对象的参数？】

一、场景

在导出的时候，只能发送get请求，但是往往我们会遇到很多查询条件，这时候使用json格式的参数，往往会使问题变得更简单。

Demo案例：

请求（真实请求）：http://localhost:8080/hello/getUrlParam?user={"name":"jj","age":22}

请求(转义后)：http://localhost:8080/hello/getUrlParam?user=%7b%22name%22:%22jj%22,%22age%22:22%7d

注意：引号可以不转义，只转义大括号就行

http://localhost:8080/hello/getUrlParam?user=%7b"name":"jj","age":22%7d,也可以正常请求

后台代码：

1.实体类

@Data
public class Person {
    private String name;
    private String age;
    private String sex;
}

2.controller

@RestController
@RequestMapping("/hello")
public class Hello {
    @GetMapping("/getUrlParam")
    public User getUrlParam(@RequestParam("user") String user){
        User user1 = JSONObject.parseObject(user, User.class);
        return user1;
    }
}

#注意：
　　@RequestParam("user")，当url中的参数名和后台不一致时使用，此处可以省略

3.pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.73</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

运行结果：