我在从HttpRequest JavaDoc编译简单的阻塞GET示例时遇到问题:
package org.example;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import static java.net.http.HttpRequest.noBody;
import static java.net.http.HttpResponse.asString;
public class Http2 {
public static void main(String[] args) throws URISyntaxException, IOException, InterruptedException {
HttpResponse response = HttpRequest
.create(new URI("http://www.infoq.com"))
.body(noBody())
.GET().response();
int responseCode = response.statusCode();
String responseBody = response.body(asString());
System.out.println(responseBody);
}
}
使用JDK 9进行编译时出错 package java.net.http does not exist
:
{ jdk9 } » /cygdrive/c/Program\ Files/Java/jdk-9/bin/javac -d out/production -modulesourcepath org.example.module1/src/ -m org.example.module1
org.example.module1\src\org.example.module1\org\example\Http2.java:6: error: package java.net.http does not exist
import java.net.http.HttpRequest;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:7: error: package java.net.http does not exist
import java.net.http.HttpResponse;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:9: error: package java.net.http does not exist
import static java.net.http.HttpRequest.noBody;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:9: error: static import only from classes and interfaces
import static java.net.http.HttpRequest.noBody;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:10: error: package java.net.http does not exist
import static java.net.http.HttpResponse.asString;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:10: error: static import only from classes and interfaces
import static java.net.http.HttpResponse.asString;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:14: error: cannot find symbol
HttpResponse response = HttpRequest
^
symbol: class HttpResponse
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:14: error: cannot find symbol
HttpResponse response = HttpRequest
^
symbol: variable HttpRequest
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:16: error: cannot find symbol
.body(noBody())
^
symbol: method noBody()
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:19: error: cannot find symbol
String responseBody = response.body(asString());
^
symbol: method asString()
location: class Http2
10 errors
使用命令行和IntelliJ发生相同的错误 .
这不是我的模块的问题,因为没有java.net.http的类编译并运行没有任何问题 .
知道发生了什么事吗?
3 回答
在
src/org/example/module-info.java
中定位(基于包名称)的模块定义中,需要将依赖项添加到java.net.http
包中,该包包含在java.httpclient
模块中:您可以在module summary中找到JDK模块列表 .
同时,自从构建了jdk9的149个类
HttpClient
HttpRequest
HttpResponse
WebSocket
已被移至包
jdk.incubator.http
. 它们是拼图模块jdk.incubator.httpclient
的一部分 . 有关详细信息,请参见ticket JDK-8170648 .因此,您必须将导入更改为
jdk.incubator.http.*
. 此外,您必须在module-info.java
中包含模块jdk.incubator.httpclient
. 编译和运行代码时,请将参数--add-modules=jdk.incubator.httpclient
添加到java和javac可执行文件的调用中 .所有与http客户端相关的类都已从jdk9中删除 . 它们作为孵化器功能包含在内,不再是API的一部分 . 希望新客户将成为jdk10的一部分 .
在JDK 11中,包是
模块名称是
java.net.http