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前言

【第6章】spring类型转换器
在spring系列已经介绍了类型转换器、接下来我们通过案例了解下转换器在SpringMvc中的应用。

场景模拟：我们接收到客户端请求,解析请求字符串及进一步解析请求体,返回Request请求对象。

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一、请求对象

package org.example.springmvc.converters.custom;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

/**
 * Create by zjg on 2024/5/1
 */
@Getter
@Setter
@ToString
public class Request {
    private String id;//流水号
    private String headers;//请求头
    private String body;//请求体
    private String timestamp;//时间戳
    private String salt;//盐值
}

二、自定义转换器

package org.example.springmvc.converters.custom;

import com.alibaba.fastjson2.JSONObject;
import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;
import java.util.Base64;

/**
 * Create by zjg on 2024/5/1
 */
public class RequestConverter implements Converter<String,Request> {
    @Override
    public Request convert(String source) {
        Request request = JSONObject.parseObject(source, Request.class);
        if(!StringUtils.hasText(request.getId())){
            throw new IllegalArgumentException("请求流水号不能为空!");
        }
        request.setBody(new String(Base64.getDecoder().decode(request.getBody())));
        return request;
    }
}

三、注册转换器

package org.example.springmvc.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * Create by zjg on 2024/4/27
 */
@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new RequestConverter());
        WebMvcConfigurer.super.addFormatters(registry);
    }
}

四、控制器

package org.example.springmvc.converters;

import com.alibaba.fastjson2.JSONObject;
import org.example.springmvc.converters.custom.Request;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Create by zjg on 2024/5/1
 */
@RestController
public class ConverterController {
    @RequestMapping("/getRequest")
    public String getRequest(){
        Request request=new Request();
        request.setId("B490B5EBF6F3CD402E515D22BCDA1598");
        request.setHeaders("");
        request.setBody("5a+55oiR5p2l6K+077yM5YGa6I+c5YGa6Z2i5YyF5piv5LiA56eN5aix5LmQ5pa55byP77yM5piv5omT5Y+R5pe26Ze055qE5pyJ5pWI5omL5q6177yM5piO55m95ZCX77yf");
        request.setTimestamp("1714573836828");
        request.setSalt("123456");
        return JSONObject.toJSONString(request);
    }
    @RequestMapping("/request")
    public Request request(Request request){
        System.out.println(request);
        return request;
    }
}

五、执行顺序

localhost:8080/getRequest
localhost:8080/request

六、执行结果

Request(id=B490B5EBF6F3CD402E515D22BCDA1598, headers=, body=对我来说，做菜做面包是一种娱乐方式，是打发时间的有效手段，明白吗？, timestamp=1714573836828, salt=123456)

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总结

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