SpringMVC: UriComponents的用法

package cn.edu.tju.handler;

import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.DefaultUriBuilderFactory;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;

import java.net.URI;

public class TestMe {
    public static void main(String[] args) {
        UriComponents uriComponents = UriComponentsBuilder
                .fromUriString("https://example.com/hotels/{hotel}")
                .queryParam("q", "{q}")
                .queryParam("r", "{r}")
                .encode()
                .build();

        URI uri = uriComponents.expand("London", "123","tju").toUri();
        System.out.println(uri);

        URI uri2 = UriComponentsBuilder
                .fromUriString("https://example.com/hotels/{hotel}")
                .queryParam("q", "{q}")
                .queryParam("r", "{r}")
                .encode()
                .buildAndExpand("London","123","tju").toUri();

        System.out.println(uri2);


        URI uri3 = UriComponentsBuilder
                .fromUriString("https://example.com/hotels/{hotel}")
                .queryParam("q", "{q}")
                .queryParam("r", "{r}")
                .encode()
                .build("London","123","tju");

        System.out.println(uri3);

        URI uri4 = UriComponentsBuilder
                .fromUriString("https://example.com/hotels/{hotel}?q={q}&r={r}")
                .build("London","123","tju");

        System.out.println(uri4);

        String baseUrl = "https://example.com";
        DefaultUriBuilderFactory uriBuilderFactory = new DefaultUriBuilderFactory(baseUrl);

        URI uri5 = uriBuilderFactory.uriString("/hotels/{hotel}")
                .queryParam("q", "{q}")
                .queryParam("r", "{r}")

                .build("London","123","tju");
        System.out.println(uri5);


    }
}

输出结果：

https://example.com/hotels/London?q=123&r=tju