如何使用 URI 模板在 Java 中更改 URL 中的路径参数
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how to use URI templates to change path parameters in a URL in java
提问by Kasun Siyambalapitiya
I followed the tutorial available in herefor replacing path parameters with given values and ran the sample code which is given below
我按照此处提供的教程使用给定值替换路径参数并运行下面给出的示例代码
import org.glassfish.jersey.uri.UriTemplate;
import javax.ws.rs.core.UriBuilder;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
public class Demo {
public static void main(String[] args) {
String template = "http://example.com/name/{name}/age/{age}";
UriTemplate uriTemplate = new UriTemplate(template);
String uri = "http://example.com/name/Bob/age/47";
Map<String, String> parameters = new HashMap<>();
// Not this method returns false if the URI doesn't match, ignored
// for the purposes of the this blog.
uriTemplate.match(uri, parameters);
System.out.println(parameters);
parameters.put("name","Arnold");
parameters.put("age","110");
UriBuilder builder = UriBuilder.fromPath(template);
URI output = builder.build(parameters);
System.out.println(output.toASCIIString());
}
}
but when I compile the code it gives me this error
但是当我编译代码时，它给了我这个错误
Exception in thread "main" java.lang.IllegalArgumentException: The template variable 'age' has no value
Exception in thread "main" java.lang.IllegalArgumentException: The template variable 'age' has no value
Please help me out to fix this, (may be my imports are causing the issue)
请帮我解决这个问题，（可能是我的导入导致了这个问题）
回答by Norb Braun
public static void main(String[] args) {
String template = "http://example.com/name/{name}/age/{age}";
UriTemplate uriTemplate = new UriTemplate(template);
String uri = "http://example.com/name/Bob/age/47";
Map<String, String> parameters = new HashMap<>();
// Not this method returns false if the URI doesn't match, ignored
// for the purposes of the this blog.
uriTemplate.match(uri, parameters);
System.out.println(parameters);
parameters.put("name","Arnold");
parameters.put("age","110");
UriBuilder builder = UriBuilder.fromPath(template);
// Use .buildFromMap()
URI output = builder.buildFromMap(parameters);
System.out.println(output.toASCIIString());
}
If you are using .buildfor filling the template, you have to provide the values one by one like .build("Arnold", "110"). In your case you want to use .buildFromMap()with your parametersmap.
如果.build用于填充模板，则必须一一提供值，例如.build("Arnold", "110"). 在您的情况下，您想.buildFromMap()与parameters地图一起使用。
