java - 无法在 Java 中运行简单的 HTTP 客户端

Question

在我的代码目录下，有以下文件:

apache-httpcomponents-httpcore.jar
httpclient-4.0.3.jar
java-json.jar

和一个java源文件:

JSONLoader.java

我在同一目录下执行以下命令:

javac -cp *;. JSONLoader.java

和

java -cp "*;." JSONLoader

我在第二个命令后收到以下错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
        at org.apache.http.impl.client.AbstractHttpClient.<init>(AbstractHttpClient.java:159)
        at org.apache.http.impl.client.DefaultHttpClient.<init>(DefaultHttpClient.java:178)
        at JSONLoader.main(JSONLoader.java:20)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 3 more

这是java代码文件:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class JSONLoader {

/**
 * @param args
 */
public static void main(String[] args) {
     try {

            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet getRequest = new HttpGet(
                "http://www.espncricinfo.com/netstorage/754739.json");
            getRequest.addHeader("accept", "application/json");

            HttpResponse response = httpClient.execute(getRequest);

            if (response.getStatusLine().getStatusCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : "
                   + response.getStatusLine().getStatusCode());
            }

            BufferedReader br = new BufferedReader(
                             new InputStreamReader((response.getEntity().getContent())));

            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }

            httpClient.getConnectionManager().shutdown();

          } catch (ClientProtocolException e) {

            e.printStackTrace();

          } catch (IOException e) {

            e.printStackTrace();
          }

    }
}

我错过了什么吗？

Answer 1

下载 commons-logging.jar 并将其添加到您的类路径中。