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resttemplate exchange方法，两种用法结果不一样

发布时间 2023-09-27 11:18:47作者: 镇魂帆-张

有问题的代码

import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;

import java.net.URI;
import java.util.Arrays;

/**
 * <p>Title:</p>
 * <p>Description:</p>
 *
 * @author zhanghong
 * @date 2023/9/27
 */
public class Test {
    public static void main(String[] args) throws Exception {
        HttpHeaders headers = new HttpHeaders();
        headers.set("appkey", "c9406731-50bc-4e23-b3f5-b7e7d3093875");
        headers.set("sign", "OhnuJEJU/SVCvf4oZhOzRQ==");
        headers.setContentType(MediaType.APPLICATION_PDF);
        headers.setAccept(Arrays.asList(MediaType.ALL));
        headers.set("time", "1695776131807");
        String url = "http://220.191.224.202:28800/PrintServer/api/PrintWord?groupGuid=%7BC05481E9-4FD1-4A6E-B6E1-D100CF1377EA%7D&toRowGuid=100000000015&dataGuid=01103ebf-a884-4282-b996-78dd64196946";
        HttpEntity httpEntity = new HttpEntity<>( headers);
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<byte[]> exchange1 = restTemplate.exchange(url, HttpMethod.GET, httpEntity, byte[].class);
        byte[] body1 = exchange1.getBody();

        URI uri =new URI(url);
        RequestEntity<Void> requestEntity =
                RequestEntity.get(uri)
                        .header("appkey", "c9406731-50bc-4e23-b3f5-b7e7d3093875")
                        .header("sign", "OhnuJEJU/SVCvf4oZhOzRQ==")
                        .header("time", "1695776131807")
                        .build();
        ResponseEntity<byte[]> exchange2 = restTemplate.exchange(requestEntity, byte[].class);
        byte[] body2 = exchange2.getBody();
    }
}

上面的代码，exchange1报错，exchagne2正常获取数据，
原因是exchange1对url做了二次编码，而exchagne2没有

解决方案：

        String url = "http://220.191.224.202:28800/PrintServer/api/PrintWord?groupGuid=%7BC05481E9-4FD1-4A6E-B6E1-D100CF1377EA%7D&toRowGuid=100000000015&dataGuid=01103ebf-a884-4282-b996-78dd64196946";
        RestTemplate restTemplate = new RestTemplate();

        String baseUrl = "http://220.191.224.202:28800/PrintServer/api/PrintWord";
        // 占位符的值已经正确编码，不需要手动编码
        String groupGuid = "{C05481E9-4FD1-4A6E-B6E1-D100CF1377EA}";
        String toRowGuid = "100000000015";
        String dataGuid = "01103ebf-a884-4282-b996-78dd64196946";

        UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(baseUrl)
                .queryParam("groupGuid", groupGuid)
                .queryParam("toRowGuid", toRowGuid)
                .queryParam("dataGuid", dataGuid);
        URI uri = builder.build().toUri();


        HttpHeaders headers = new HttpHeaders();
        headers.set("appkey", "c9406731-50bc-4e23-b3f5-b7e7d3093875");
        headers.set("sign", "OhnuJEJU/SVCvf4oZhOzRQ==");
        headers.set("Accept","application/octet-stream, application/json, application/*+json, */*");
        headers.set("time", "1695776131807");
        HttpEntity httpEntity = new HttpEntity<>( headers);
        ResponseEntity<byte[]> exchange1 = restTemplate.exchange(uri, HttpMethod.GET, httpEntity, byte[].class);
        byte[] body1 = exchange1.getBody();

        URI uri2 =new URI(url);
        RequestEntity<Void> requestEntity =
                RequestEntity.get(uri2)
                        .header("appkey", "c9406731-50bc-4e23-b3f5-b7e7d3093875")
                        .header("sign", "OhnuJEJU/SVCvf4oZhOzRQ==")
                        .header("time", "1695776131807")
                        .build();
        ResponseEntity<byte[]> exchange2 = restTemplate.exchange(requestEntity, byte[].class);
        byte[] body2 = exchange2.getBody();