新手问题：关于使用Servlet获取非页面信息并操作的方法？
刚开始学习servlet，想通过servlet去获取另一个Java类中的信息或文件系统中的信息，而不是获取页面的信息。然后把获取的信息传给另一个Java类去操作，最后返回第一个Java类或本地文件系统中。
请问高手应该如何编写，最好能有一小段代码学习学习，非常感谢。
[解决办法]
java客户端
package test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.X509TrustManager;
/**
* @author Yangjs 2007-3-29
*/
public class MessageSender {
// 重写X509TrustManager类的三个方法,信任服务器证书
private static X509TrustManager xTrustManager = new X509TrustManager() {
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() {
return null;
}
};
// 信任主机名
private static HostnameVerifier hostNameVerifier = new HostnameVerifier() {
public boolean verify(String hostname, SSLSession session) {
return true;
}
};
/**
* 信任主机,无论主机名和证书为多少都信任主机,以此来建立连接. 避免了在客户端配置证书
*/
private static void trustServer() {
SSLContext sslContext = null;
try {
sslContext = SSLContext.getInstance( "TLS ");
X509TrustManager[] xtmArray = new X509TrustManager[] { xTrustManager };
sslContext.init(null, xtmArray, new java.security.SecureRandom());
} catch (GeneralSecurityException e) {
e.printStackTrace();
}
if (sslContext != null) {
HttpsURLConnection.setDefaultSSLSocketFactory(sslContext
.getSocketFactory());
}
HttpsURLConnection.setDefaultHostnameVerifier(hostNameVerifier);
}
/**
* 通过HTTPS发送消息
*
* @param url
* 要连接的servlet名
* @param message
* 要保存到文件的字符串
* @return 从另一个文件读取的字符串
*/
static String send(URL url, String message) {
trustServer();
HttpsURLConnection connection = null;
try {
connection = (HttpsURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
connection.setDoOutput(true);
PrintWriter printWriter = null;
try {
printWriter = new PrintWriter(connection.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
printWriter.print(message);
printWriter.flush();
printWriter.close();
BufferedReader in = null;
try {
in = new BufferedReader(new InputStreamReader(connection
.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
String currentLine = " ";
String totalString = " ";
try {
while ((currentLine = in.readLine()) != null)
if (currentLine.length() > 0)
totalString = totalString + currentLine + "\n ";
} catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (in != null) {
in.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return totalString;
}
}
serlvet端 ：
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* @author Yangjs
* 2007-3-29
*/
public class MessageReceiver extends HttpServlet {
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
messageProcess(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
messageProcess(request, response);
}
private void messageProcess(HttpServletRequest request,
HttpServletResponse response) throws IOException {
InputStream is = request.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String sCurrentLine = " ";
String sTotalString = " ";
while ((sCurrentLine = reader.readLine()) != null)
if (sCurrentLine.length() > 0)
sTotalString = sTotalString + sCurrentLine.trim();
FileAccesser.saveStringToFile(sTotalString);
String newMessage = FileAccesser.loadFileToString();
PrintWriter out = response.getWriter();
out.println(newMessage);
}
}
客户端 测试方法：
package test;
import java.net.MalformedURLException;
import java.net.URL;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
URL url = null;
try {
url = new URL( "https://localhost/message ");
} catch ( MalformedURLException e) {
e.printStackTrace();
}
System.out.print(MessageSender.send( url, "ssds123456 "));
}
}
