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fixed the java conntetor API bugs, use utf-8 charset to transfer data.

This commit is contained in:
Caesar11 2014-12-11 01:09:23 -05:00
parent c07f110097
commit 6ea3b20683
2 changed files with 26 additions and 10 deletions
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api/java/lib/GstoreJavaAPI.jar
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36
api/java/src/jgsc/GstoreConnector.java
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@ -121,7 +121,7 @@ public class GstoreConnector
boolean connect_return = this.connect(); boolean connect_return = this.connect();
if (!connect_return) if (!connect_return)
{ {
System.err.println("connect to server error. @GstoreConnector.query"); System.err.println("connect to server error. @GstoreConnector.build");
return "connect to server error."; return "connect to server error.";
} }
@ -129,7 +129,7 @@ public class GstoreConnector
boolean send_return = this.send(cmd); boolean send_return = this.send(cmd);
if (!send_return) if (!send_return)
{ {
System.err.println("send query command error. @GstoreConnector.query"); System.err.println("send query command error. @GstoreConnector.build");
return "send query command error."; return "send query command error.";
} }
String recv_msg = this.recv(); String recv_msg = this.recv();
@ -209,7 +209,7 @@ public class GstoreConnector
// in Java String, there is no need for terminator '\0' in C. so we should omit '\0' at the end of receiving message. // in Java String, there is no need for terminator '\0' in C. so we should omit '\0' at the end of receiving message.
byte[] data_context = new byte[context_len-1]; byte[] data_context = new byte[context_len-1];
dis.read(data_context); dis.read(data_context);
String ret = new String(data_context); String ret = new String(data_context,"utf-8");
return ret; return ret;
} }
@ -224,7 +224,16 @@ public class GstoreConnector
private static byte[] packageMsgData(String _msg) private static byte[] packageMsgData(String _msg)
{ {
byte[] data_context = _msg.getBytes(); //byte[] data_context = _msg.getBytes();
byte[] data_context = null;
try {
data_context = _msg.getBytes("utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.err.println("utf-8 charset is unsupported.");
data_context = _msg.getBytes();
}
int context_len = data_context.length + 1; // 1 byte for '\0' at the end of the context. int context_len = data_context.length + 1; // 1 byte for '\0' at the end of the context.
int data_len = context_len + 4; // 4 byte for one int(data_len at the data's head). int data_len = context_len + 4; // 4 byte for one int(data_len at the data's head).
byte[] data = new byte[data_len]; byte[] data = new byte[data_len];
@ -258,20 +267,27 @@ public class GstoreConnector
private static int byte4ToInt(byte[] _b) // with Little Endian format. private static int byte4ToInt(byte[] _b) // with Little Endian format.
{ {
int byte0 = _b[0], byte1 = _b[1], byte2 = _b[2], byte3 = _b[3]; int byte0 = _b[0]&0xFF, byte1 = _b[1]&0xFF, byte2 = _b[2]&0xFF, byte3 = _b[3]&0xFF;
int ret = (byte0) | (byte1 << 8) | (byte2 << 16) | (byte3 << 24); int ret = (byte0) | (byte1 << 8) | (byte2 << 16) | (byte3 << 24);
return ret; return ret;
} }
public static void main(String[] args) public static void main(String[] args)
{ {
// initialize the GStore server's IP address and port.
GstoreConnector gc = new GstoreConnector("172.31.19.15", 3305); GstoreConnector gc = new GstoreConnector("172.31.19.15", 3305);
boolean load_return = gc.load("db_LUBM10"); // build a new database by a RDF file.
System.out.println(load_return); // note that the relative path is related to gserver.
//gc.build("db_LUBM10", "example/rdf_triple/LUBM_10_GStore.n3");
String sparql = "select ?x where {"
+ "<cdblp.cn/namedisambiguation/ÓÚ¸ê/Unknown/2857.html> <cdblp.cn/schema/property/hasPaper> ?x. "
+ "}";
load_return = gc.unload("db_LUBM10"); gc.load("db_cdblp");
System.out.println(load_return); String answer = gc.query(sparql);
System.out.println(answer);
} }
} }