Question

使用Java 6，Tomcat 7，Jersey，HttpClient和ehCache Server。

在$ CATALINA_HOME / ehcache / WEB-INF / classes / ehcache.xml

中注册了一个名为ipad的新缓存

<cache name="ipad"
           maxElementsInMemory="10000"
           eternal="true"
           overflowToDisk="false"
           memoryStoreEvictionPolicy="FIFO"
/>

这就是我的客户端的样子：

import org.apache.http.impl.client.DefaultHttpClient;

public class EhCachePostClient {
    public static void main(String[] args) throws Exception {   
            String jsonString = "{\"qty\":100,\"name\":\"iPad 4\"}";

            // Post the same object to ehCache
            DefaultHttpClient ehCacheClient = new DefaultHttpClient();
            String ehCacheResponseString =
    EhCacheClientHelper.getEhCacheJsonResponseString(ehCacheClient, jsonString);
            System.out.println("\nFrom ehCache Server: " + ehCacheResponseString);
            ehCacheClient.getConnectionManager().shutdown();
    }
}

这是EhCacheClientHelper类（完成了大部分工作）：

import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

public class EhCacheClientHelper {

    private static final String EHCACHE_IPAD_URI 
                   = "http//localhost:8080/ehcache/rest/ipad";

    public static String getEhCacheJsonResponseString(
                DefaultHttpClient httpClient, String responseString) 
    throws Exception {
        HttpPost postRequest = new HttpPost(EHCACHE_MDS_URI);

        StringEntity input = new StringEntity(responseString);
        input.setContentType("application/json");
        postRequest.setEntity(input);

        HttpResponse response = httpClient.execute(postRequest);

        if (response.getStatusLine().getStatusCode() != 201) {
            throw new RuntimeException("Failed : HTTP error code : " 
                     + response.getStatusLine().getStatusCode());
        }

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

        String output;
        StringBuilder ehCacheOutput = new StringBuilder();
        System.out.println("\nOutput from ehCache Server .... \n");
        while ((output = br.readLine()) != null) {
            ehCacheOutput.append(output);
        }
        return ehCacheOutput.toString();
    }
}

这是我得到的例外：

Exception in thread "main" java.lang.IllegalStateException: Target host must not be null, or set in parameters.
    at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:784)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:414)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
    at com.myapp.client.EhCacheClientHelper.getEhCacheJsonResponseString(EhCacheClientHelper.java:22)
    at com.myapp.client.EhCachePostClient.main(EhCachePostClient.java:19)

我做错了什么？

我想要做的就是在ehCache中创建一个示例缓存，向其发布某种类型的JSON对象，然后使用curl命令检索它。

这是一件难事吗？我缺少什么（在实施，配置等方面）？

感谢您抽出宝贵时间阅读此内容......

Answer 1

你有：

HTTP //...

应该是：

的http：// ...

你错过了“：”

IllegalStateException：使用POST通过HttpClient使用JSON对象填充ehCache

1 个答案: