我在我的android项目中使用以下代码片段连接到几个活动中的tomcat服务器，我想将它移动到另一个类 - 封装此代码片段。通过封装，我不必像以前那样通过每个连接加载和创建证书，密钥库和信任。
URL url;
HttpsURLConnection connection = null;
try {
// Load CAs from an InputStream
CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream caInput = new BufferedInputStream(getAssets().open("my_certificate.crt"));
Certificate ca = cf.generateCertificate(caInput);
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
String urlParameters = SOME_PARAMETERS;
url = new URL(SOME_URL);
connection = (HttpsURLConnection) url.openConnection();
connection.setSSLSocketFactory(context.getSocketFactory());
connection.setUseCaches(false);
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setFixedLengthStreamingMode(urlParameters.getBytes().length);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
PrintWriter out = new PrintWriter(connection.getOutputStream());
out.print(urlParameters);
out.close();
是否可以将前4个子段移动到新类的方法并将第一次调用的结果存储为静态字段？实施例
public class ConnectionPreparer {
private static SSLSocketFactory sslSocketFactory;
private Context context;
public ConnectionPreparer (Context context){
this.context = context;
}
private SSLSocketFactory getSSLSocketFactory(){
if(sslSocketFactory==null){
CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream caInput = new BufferedInputStream(context.getAssets().open("my_certificate.crt"));
Certificate ca = cf.generateCertificate(caInput);
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
sslSocketFactory = context.getSocketFactory();
}
return sslSocketFactory;
}
public HttpsURLConnection prepareConnection(){
URL url = SOME_URL;
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
connection.setSSLSocketFactory(getSSLSocketFactory());
// and so on
}
}
如果不是为什么不好？如果它还可以，我很高兴。
感谢您的关注！
答案 0 :(得分：0)
是的，它有效。这是一个结果类。
import android.content.Context;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.Scanner;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManagerFactory;
/**
* Created by Rinomancer on 20.08.2015.
*/
public class ConnectionBuilder {
private static SSLSocketFactory sslSocketFactory;
private Context context;
private URL url;
private String parameters = "";
private String response;
private HttpsURLConnection connection;
public ConnectionBuilder() {
}
public ConnectionBuilder(Context context, URL url) {
this.context = context;
this.url = url;
}
private SSLSocketFactory getSSLSocketFactory() throws Exception {
if (sslSocketFactory == null) {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream caInput = new BufferedInputStream(context.getAssets().open("my_certificate.crt"));
Certificate ca = cf.generateCertificate(caInput);
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
sslSocketFactory = context.getSocketFactory();
}
return sslSocketFactory;
}
public ConnectionBuilder connect() throws Exception {
connection = null;
try {
connection = (HttpsURLConnection) url.openConnection();
connection.setSSLSocketFactory(getSSLSocketFactory());
connection.setConnectTimeout(5000);
connection.setUseCaches(false);
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setFixedLengthStreamingMode(parameters.getBytes().length);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
if (sessionId != null && !sessionId.isEmpty()) {
connection.setRequestProperty("Session-Id", sessionId);
}
PrintWriter out = new PrintWriter(connection.getOutputStream());
out.print(parameters);
out.close();
String response = "";
Scanner inStream = new Scanner(connection.getInputStream());
while (inStream.hasNextLine()) {
response += inStream.nextLine();
}
this.response = response;
return this;
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
public ConnectionBuilder context(Context context) {
this.context = context;
return this;
}
public ConnectionBuilder url(URL url) {
this.url = url;
return this;
}
public ConnectionBuilder url(String url) throws MalformedURLException {
this.url = new URL(url);
return this;
}
public ConnectionBuilder parameter(String parameter, String value) throws UnsupportedEncodingException {
if (parameters.isEmpty()) {
parameters = parameter + "=" + URLEncoder.encode(value, "UTF-8");
} else {
parameters += "&" + parameter + "=" + URLEncoder.encode(value, "UTF-8");
}
return this;
}
public String getResponse() {
return response;
}
public String getHeader(String headerName) {
return connection.getHeaderField(headerName);
}
public int getStatusCode() throws IOException{
return connection.getResponseCode();
}
}
在Android Activity中使用此类：
try {
ConnectionBuilder cb = new ConnectionBuilder().context(getApplicationContext()).url(YOUR_URL).parameter("parameterName",parameterValue).parameter("anotherParameter",itsValue).connect();
result = cb.getResponse();
} catch (Exception e){
e.printStackTrace();
}
当然，您可以通过添加setHeader（）功能来扩展此类。但在我的情况下，这不是必要的。