Java结合applet 读取扫描枪扫描二维码
需要用到win32com.dll和javax.comm.properties
Java代码：
import java.applet.Applet;
import java.io.File;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.comm.CommPortIdentifier;
import javax.comm.NoSuchPortException;
import javax.comm.PortInUseException;
import javax.comm.SerialPort;
import javax.comm.UnsupportedCommOperationException;
import netscape.javascript.JSObject;
import com.sun.corba.se.impl.copyobject.JavaStreamObjectCopierImpl;
public class scann extends Applet {
public String PortName = "COM12";
public CommPortIdentifier portId;
public SerialPort serialPort;
public InputStream in;
public static String error = "请扫码";
public static String proName = "Serial_Communication";
private URL codeBase;
private static String libPath = "";
private static String commfile1 = "win32com.dll";
private static String commfile3 = "javax.comm.properties";
static {
System.setSecurityManager(null);
}// 不使用安全管理器
@Override
public void init() {
// TODO Auto-generated method stub
codeBase = super.getCodeBase();
String property = System.getProperty("java.library.path");
System.out.println("所有路径==>" + property);
String[] split = property.split(";");
for (String str : split) {
if (str.indexOf("jre") != -1) {
System.out.println("截取前==>" + str);
str = str.substring(0, str.indexOf("jre"))
+ str.substring(str.indexOf("jre"))
.substring(
0,
str.substring(str.indexOf("jre"))
.indexOf("/"));
libPath = str;
break;
}
}
if ("".equals(libPath)) {
return;
}
System.out.println("libPath===>" + libPath);
downFile();
System.out.println("开始加载。。。。");
Initialize(12);
}
public void Initialize(int PortID) {
PortName = "COM" + PortID;
try {
portId = CommPortIdentifier.getPortIdentifier(PortName);
try {
serialPort = (SerialPort) portId.open(proName, 2000);
} catch (PortInUseException e) {
if (!portId.getCurrentOwner().equals(proName)) {
error = "该串口被其它程序占用";
return;
}
}
try {
in = serialPort.getInputStream();
} catch (IOException e) {
error = "与扫描枪通讯连接失败,请重试!";
return;
}
try {
serialPort.setSerialPortParams(115200, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {
error = "与扫描枪通讯参数设置失败,请联系管理员!";
return;
}
} catch (NoSuchPortException e) {
error = "与扫描枪通讯参数设置失败,请联系管理员!";
e.printStackTrace();
return;
}
int c;
try {
if (in != null) {
while (true) {
if (in.available() > 0) {
error = "";
int size = in.available();
System.out.println(size);
byte[] test = new byte[size];
in.read(test);
error = new String(test, "GBK");
error = error.substring(7, error.length());
System.out.println("====> " + error);
if (error.indexOf("AAAAA") != -1) {
error = "识别错误,请重新扫描.";
} else if (error.indexOf("printer") == -1) {
error = "非复印系统编码,暂不提供解析.";
} else {
error = error.substring(7, error.length());
}
System.out.println(error);
//调用js方法
runjs(error);
}
}
}
} catch (IOException e) {
error = "读取返回结果失败,请重试!";
return;
}
}
public void runjs(String message){
JSObject window = JSObject.getWindow(this);
window.call("myMessage", new Object[]{message});
}
public void downFile() {
AccessController.doPrivileged(new PrivilegedAction<String>() {
@Override
public String run() {
try {
// 获取加载库时搜索的路径列表
File dll = new File(libPath + "/bin", commfile1);
if (!dll.exists()) {
URL url = new URL(codeBase + commfile1);
InputStream is = url.openConnection().getInputStream();
FileOutputStream fos = new FileOutputStream(dll);
byte[] buf = new byte[2048]; // 读取缓存
int len = 0;
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.flush();
fos.close();
is.close();
System.out.println("创建文件完成[" + dll + "].");
}
File dll3 = new File(libPath + "/lib", commfile3);
if (!dll3.exists()) {
URL url = new URL(codeBase + commfile3);
InputStream is = url.openConnection().getInputStream();
FileOutputStream fos = new FileOutputStream(dll3);
byte[] buf = new byte[2048]; // 读取缓存
int len = 0;
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.flush();
fos.close();
is.close();
System.out.println("创建文件完成[" + dll3 + "].");
}
System.out.println("初始化成功!");
} catch (Exception e) {
e.printStackTrace();
}
// System.load(libPath + "/bin/" + commfile1);
return "0";
}
});
}
}
jsp页面：
<applet code='scann' width="0" name="test" height ="0" codebase="<%=basePath%>auditManage" archive="scan.jar,comm.jar" mayscript="mayscript"></applet>
来调用applet