我是一个直接的新手。经过 2 周的研究，我已经到了这一点，仍然非常迷茫和绝望。
我的目标：从 EnergyStar Portfolio Manager Restful Web 服务/API 中检索数据，并将该数据放入 SQL 数据库或 Excel 工作表中。
到目前为止的进展：1）我找到了一个示例代码，它似乎很适合我的需要，除了身份验证部分。我在让 WSDL 服务工作方面比 RESTful 服务更成功。特别是对于 EnergySTAR，需要某种身份验证，我似乎无法解决。
2）检索GET协议：http: //portfoliomanager.energystar.gov/webservices/home/test/api/reporting/designMetrics/get
我的源代码：
package com;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Response;
import com.User;
@Path("/wstest/property/")
public class UserManagementModule
{
@GET
@Path("/{propertyId}/design/metrics?measurementSystem=METRIC")
@Produces("application/xml")
public Response getUserById(@PathParam("propertyId") Integer id)
{
User user = new User();
user.setId(id);
return Response.status(200).entity(user).build();
}
}package com;
import java.io.Serializable;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "propertyMetrics")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@XmlAttribute(name = "propertyId")
private int propertyId;
@XmlElement(name="metric")
private double metric;
@XmlAttribute(name = "designEnergyCost")
private double designEnergyCost;
@XmlAttribute(name = "designScore")
private double designScore;
@XmlAttribute(name = "designSiteTotal")
private double designSiteTotal;
@XmlAttribute(name = "designSiteIntensity")
private double designSiteIntensity;
@XmlAttribute(name = "designTargetEnergyCost")
private double designTargetEnergyCost;
@XmlAttribute(name = "designTargetTotalGHGEmissions")
private double designTargetTotalGHGEmissions;
@XmlAttribute(name = "designTargetSiteTotal")
private double designTargetSiteTotal;
@XmlAttribute(name = "designTargetSiteIntensity")
private double designTargetSiteIntensity;
@XmlAttribute(name = "designTargetSourceTotal")
private double designTargetSourceTotal;
@XmlAttribute(name = "designTargetSourceIntensity")
private double designTargetSourceIntensity;
@XmlAttribute(name = "medianEnergyCost")
private double medianEnergyCost;
@XmlAttribute(name = "medianTotalGHGEmissions")
private double medianTotalGHGEmissions;
@XmlAttribute(name = "medianScore")
private double medianScore;
public int getId() {
return propertyId;
}
public void setId(int propertyId) {
this.propertyId = propertyId;
}
public double getmendianScore() {
return medianScore;
}
//
// public void setFirstName(String firstName) {
// this.firstName = firstName;
// }
// public String getLastName() {
// return lastName;
// }
// public void setLastName(String lastName) {
// this.lastName = lastName;
// }
}package tests;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import com.User;
public class RestClientXML {
public static void main(String[] args)
{
try
{
URL url = new URL(" https://portfoliomanager.energystar.gov/wstest/");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/xml");
if (conn.getResponseCode() != 200)
{
throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String apiOutput = br.readLine();
System.out.println(apiOutput);
conn.disconnect();
JAXBContext jaxbContext = JAXBContext.newInstance(User.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
User user = (User) jaxbUnmarshaller.unmarshal(new StringReader(apiOutput));
System.out.println(user.getId());
/* System.out.println(user.getFirstName());
System.out.println(user.getLastName());
*/
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JAXBException e) {
e.printStackTrace();
}
}
}我知道有一些身份验证需要用户名和密码，所以我也尝试了这个而不是 RestClient 类，但都不起作用。
public static void main(String[] args) {
CloseableHttpClient httpClient = null;
HttpPost httpPost = null;
CloseableHttpResponse response = null;
try {
httpClient = HttpClients.createDefault();
httpPost = new HttpPost("https://portfoliomanager.energystar.gov/wstest/");
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("content-type", "application/xml"));
StringEntity input = new StringEntity("{\"username\": \"yungv1\",\"password\": \"dummypassword\"}");
input.setContentType("application/xml");
httpPost.setEntity(input);
for (NameValuePair h : nvps)
{
httpPost.addHeader(h.getName(), h.getValue());
}
response = httpClient.execute(httpPost);
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);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try{
response.close();
httpClient.close();
}catch(Exception ex) {
ex.printStackTrace();
}
}我知道这很草率。您能否指出我如何实现目标的方向？
我也尝试运行它，并不断收到 401 错误，我认为这是身份验证失败。我不知道还有什么方法可以解决这部分问题，以及是否还有更多需要研究的东西。