「java调用dl」java调用dll找不到指定模块
今天给各位分享java调用dl的知识，其中也会对java调用dll找不到指定模块进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
- 1、java之如何实现调用启动一个可执行文件,exe
- 2、java怎么使用dll中返回值为handle谢谢了，大神帮忙啊
- 3、java代码如何调用DL-888B打印机打印条形码
- 4、java程序如何调用Graphviz
- 5、java 如何调用另一个类的窗体并显示？
- 6、如何解决java调dll报Unable to load library的错误
java之如何实现调用启动一个可执行文件,exe
1. 从获得一个TowerJ编译器，该编译器可以将你的CLASS文件编译成EXE文件。
2. 利用微软的SDK-Java 4.0所提供的jexegen.exe创建EXE文件，这个软件可以从微软的网站免费下载，地址如下：
jexegen的语法如下：
jexegen /OUT:exe_file_name
/MAIN:main_class_name main_class_file_name.class
[and other classes]
3. Visual Cafe提供了一个能够创建EXE文件的本地编译器。你需要安装该光盘上提供的EXE组件。
4. 使用InstallAnywhere创建安装盘。
5. 使用IBM AlphaWorks提供的一个高性能Java编译器，该编译器可以从下面的地址获得：
6. JET是一个优秀的Java语言本地编译器。该编译器可以从这个网站获得一个测试版本：
7. Instantiations公司的JOVE
JOVE公司合并了以前的SuperCede，一个优秀的本地编译器，现在SuperCede已经不复存在了。
8. JToEXE
Bravo Zulu Consulting, Inc开发的一款本地编译器，本来可以从该公司的网页上免费下载的，不过目前在该公司的主页上找不到了。
java怎么使用dll中返回值为handle谢谢了，大神帮忙啊
这几天因为项目需要，用到了java调用dll文件中的方法。写成dll文件大多是用C、VB、Delphi语言弄成的，对于我这个纯粹干java的人员来说，着实让我太为难了。唉，也就是说我编程底子没有搭好，惭愧。要是这些语言我都会些，也不至少让我了解并应用这个技术花了很长时间。 我是用JNative技术做的一个例子。需要用到的是：JNative.jar,JNative.dll这些是在Windows中开发的，如果用Linus要用到libJNative.so 1.将JNative.dl，所要读的dll文件l放在C:\windows\system32下面。 2.将JNative.jar放在你的项目下的lib下面 3.将要读的dll文件放在跟使用的类相同的目录下。 4.我的类的源码 package sms; import org.xvolks.jnative.JNative; import org.xvolks.jnative.exceptions.NativeException; import org.xvolks.jnative.misc.basicStructures.AbstractBasicData; import org.xvolks.jnative.pointers.Pointer; import org.xvolks.jnative.pointers.memory.MemoryBlockFactory; public class SystemTime extends AbstractBasicDataSystemTime{ public short wYear; public short wMonth; public short wDayOfWeek; public short wDay; public short wHour; public short wMinute; public short wSecond; public short wMilliseconds;
java代码如何调用DL-888B打印机打印条形码
要是用打印机打印条形码的话，也可以不用Java代码的，除非你是这方面的专业的人员，要不这个还真搞不来，我一般打印条形码用的是一个条形码打印软件，它用的是哪种通用驱动，几乎对所有的打印机都能了连接打印的。
在这个软件里面绘制条形码，然后添加内容，并打印出来，而且现在专业的条形码打印软件支持多种类型的数据库导入，可以实现那种有多少个条码数据都能一次生成，而且可以批量打印出来，非常的方便。
上面这个是点击数据库设置可以导入那种TXT、Excel、access等很多种格式的文档，下面在添加条形码内容时，用数据库导入的方式添加，添加后直接点击预览，就能看到所有的数据按照Excel里面的顺序自动生成在每个标签上，就可以一次性打印出来所有的条形码啦
java程序如何调用Graphviz
网上有别人已经写好的一个GraphViz.java类。java可以直接调用这个类实现画图功能，但是使用这个类的前提是你的电脑已经装了GraphViz软件，你可以在下载windows版本，装完后，找到dot.exe所在的路径，我电脑上的是D:\Program Files\Graphviz2.30\bin\dot.exe,
将GraphViz.java中的这一路径改成你电脑上的路径，基本上就可以用了。
package Graphoutput;
// GraphViz.java - a simple API to call dot from Java programs
/*$Id$*/
/*
******************************************************************************
* *
* (c) Copyright 2003 Laszlo Szathmary *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 2.1 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public *
* License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program; if not, write to the Free Software Foundation, *
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
******************************************************************************
*/
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
/**
* dl
* dtPurpose: GraphViz Java API
* dd
*
* dtDescription:
* dd With this Java class you can simply call dot
* from your Java programs
* dtExample usage:
* dd
* pre
* GraphViz gv = new GraphViz();
* gv.addln(gv.start_graph());
* gv.addln("A - B;");
* gv.addln("A - C;");
* gv.addln(gv.end_graph());
* System.out.println(gv.getDotSource());
*
* String type = "gif";
* File out = new File("out." + type); // out.gif in this example
* gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out );
* /pre
* /dd
*
* /dl
*
* @version v0.4, 2011/02/05 (February) -- Patch of Keheliya Gallaba is added. Now you
* can specify the type of the output file: gif, dot, fig, pdf, ps, svg, png, etc.
* @version v0.3, 2010/11/29 (November) -- Windows support + ability
* to read the graph from a text file
* @version v0.2, 2010/07/22 (July) -- bug fix
* @version v0.1, 2003/12/04 (December) -- first release
* @author Laszlo Szathmary (a href="jabba.laci@gmail.com"jabba.laci@gmail.com/a)
*/
public class GraphViz
{
/**
* The dir. where temporary files will be created.
*/
//private static String TEMP_DIR = "/tmp"; // Linux
private static String TEMP_DIR = "c:/temp"; // Windows
/**
* Where is your dot program located? It will be called externally.
*/
// private static String DOT = "/usr/bin/dot"; // Linux
private static String DOT = "D:\\Program Files\\Graphviz2.30\\bin\\dot.exe"; // Windows
/**
* The source of the graph written in dot language.
*/
private StringBuilder graph = new StringBuilder();
/**
* Constructor: creates a new GraphViz object that will contain
* a graph.
*/
public GraphViz() {
}
/**
* Returns the graph's source description in dot language.
* @return Source of the graph in dot language.
*/
public String getDotSource() {
return graph.toString();
}
/**
* Adds a string to the graph's source (without newline).
*/
public void add(String line) {
graph.append(line);
}
/**
* Adds a string to the graph's source (with newline).
*/
public void addln(String line) {
graph.append(line + "\n");
}
/**
* Adds a newline to the graph's source.
*/
public void addln() {
graph.append('\n');
}
/**
* Returns the graph as an image in binary format.
* @param dot_source Source of the graph to be drawn.
* @param type Type of the output image to be produced, e.g.: gif, dot, fig, pdf, ps, svg, png.
* @return A byte array containing the image of the graph.
*/
public byte[] getGraph(String dot_source, String type)
{
File dot;
byte[] img_stream = null;
try {
dot = writeDotSourceToFile(dot_source);
if (dot != null)
{
img_stream = get_img_stream(dot, type);
if (dot.delete() == false)
System.err.println("Warning: " + dot.getAbsolutePath() + " could not be deleted!");
return img_stream;
}
return null;
} catch (java.io.IOException ioe) { return null; }
}
/**
* Writes the graph's image in a file.
* @param img A byte array containing the image of the graph.
* @param file Name of the file to where we want to write.
* @return Success: 1, Failure: -1
*/
public int writeGraphToFile(byte[] img, String file)
{
File to = new File(file);
return writeGraphToFile(img, to);
}
/**
* Writes the graph's image in a file.
* @param img A byte array containing the image of the graph.
* @param to A File object to where we want to write.
* @return Success: 1, Failure: -1
*/
public int writeGraphToFile(byte[] img, File to)
{
try {
FileOutputStream fos = new FileOutputStream(to);
fos.write(img);
fos.close();
} catch (java.io.IOException ioe) { ioe.printStackTrace();return -1; }
return 1;
}
/**
* It will call the external dot program, and return the image in
* binary format.
* @param dot Source of the graph (in dot language).
* @param type Type of the output image to be produced, e.g.: gif, dot, fig, pdf, ps, svg, png.
* @return The image of the graph in .gif format.
*/
private byte[] get_img_stream(File dot, String type)
{
File img;
byte[] img_stream = null;
try {
img = File.createTempFile("graph_", "."+type, new File(GraphViz.TEMP_DIR));
Runtime rt = Runtime.getRuntime();
// patch by Mike Chenault
String[] args = {DOT, "-T"+type, dot.getAbsolutePath(), "-o", img.getAbsolutePath()};
Process p = rt.exec(args);
p.waitFor();
FileInputStream in = new FileInputStream(img.getAbsolutePath());
img_stream = new byte[in.available()];
in.read(img_stream);
// Close it if we need to
if( in != null ) in.close();
if (img.delete() == false)
System.err.println("Warning: " + img.getAbsolutePath() + " could not be deleted!");
}
catch (java.io.IOException ioe) {
System.err.println("Error: in I/O processing of tempfile in dir " + GraphViz.TEMP_DIR+"\n");
System.err.println(" or in calling external command");
ioe.printStackTrace();
}
catch (java.lang.InterruptedException ie) {
System.err.println("Error: the execution of the external program was interrupted");
ie.printStackTrace();
}
return img_stream; }
/**
* Writes the source of the graph in a file, and returns the written file
* as a File object.
* @param str Source of the graph (in dot language).
* @return The file (as a File object) that contains the source of the graph.
*/
public File writeDotSourceToFile(String str) throws java.io.IOException
{
File temp;
try {
temp = File.createTempFile("graph_", ".dot.tmp", new File(GraphViz.TEMP_DIR));
FileWriter fout = new FileWriter(temp);
fout.write(str);
fout.close();
}
catch (Exception e) {
System.err.println("Error: I/O error while writing the dot source to temp file!");
return null;
}
return temp;
}
/**
* Returns a string that is used to start a graph.
* @return A string to open a graph.
*/
public String start_graph() {
return "digraph G {" ;
}
/**
* Returns a string that is used to end a graph.
* @return A string to close a graph.
*/
public String end_graph() {
return "}";
}
/**
* Read a DOT graph from a text file.
*
* @param input Input text file containing the DOT graph
* source.
*/
public void readSource(String input)
{
StringBuilder sb = new StringBuilder();
try
{
FileInputStream fis = new FileInputStream(input);
DataInputStream dis = new DataInputStream(fis);
BufferedReader br = new BufferedReader(new InputStreamReader(dis));
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
dis.close();
}
catch (Exception e) {
System.err.println("Error: " + e.getMessage());
}
this.graph = sb;
}
} // end of class GraphViz
通过下面这个类调用graphViz.java
import java.io.File;
public class Proba
{
public static void main(String[] args)
{
Proba p = new Proba();
p.start();
// p.start2();
}
/**
* Construct a DOT graph in memory, convert it
* to image and store the image in the file system.
*/
private void start()
{
GraphViz gv = new GraphViz();
gv.addln(gv.start_graph());
gv.addln("A - B;");
gv.addln("A - C;");
gv.addln(gv.end_graph());
System.out.println(gv.getDotSource());
String type = "gif";
// String type = "dot";
// String type = "fig"; // open with xfig
// String type = "pdf";
// String type = "ps";
// String type = "svg"; // open with inkscape
// String type = "png";
// String type = "plain";
File out = new File("/tmp/out." + type); // Linux
// File out = new File("c:/eclipse.ws/graphviz-java-api/out." + type); // Windows
gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out );
}
/**
* Read the DOT source from a file,
* convert to image and store the image in the file system.
*/
private void start2()
{
// String dir = "/home/jabba/eclipse2/laszlo.sajat/graphviz-java-api"; // Linux
// String input = dir + "/sample/simple.dot";
String input = "c:/eclipse.ws/graphviz-java-api/sample/simple.dot"; // Windows
GraphViz gv = new GraphViz();
gv.readSource(input);
System.out.println(gv.getDotSource());
String type = "gif";
// String type = "dot";
// String type = "fig"; // open with xfig
// String type = "pdf";
// String type = "ps";
// String type = "svg"; // open with inkscape
// String type = "png";
// String type = "plain";
File out = new File("/tmp/simple." + type); // Linux
// File out = new File("c:/eclipse.ws/graphviz-java-api/tmp/simple." + type); // Windows
gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out );
}
}
java 如何调用另一个类的窗体并显示？
要调用另一个类的窗体并显示，可以将另一个窗口的类new一个对象，然后设置可见。
1，比如两个类，一个登录界面Login,一个主界面Main
2，在Login中登录按钮添加监听事件
3，在监听事件中添加代码
{
// 登录验证。
if（ok）{
Main frame = new Main();
frame.setVisible(true); // 打开新界面
dispose(); // 关闭当前界面
}
}
如何解决java调dll报Unable to load library的错误
解决java调dll报Unable to load library的错误可以尝试以下方法：
载入库文件有两个函数，System.load 和 System.loadLibrary。
当使用System.load时，需要输入文件的全路径，例如：System.load(“/tmp/test.so”);
当使用System.loadlibrary时是在系统的library 的目录中需找复合条件的库文件，可以使用-Djava.library.path=[path]参数，来指定Java程序加载库文件的路径，或者将库文件（*.so,*.dll）复制到include的默认路径，Linux一般是/usr/lib目录下，当然你可以编辑/etc/ld.so.conf.d/下的文件，设定自己的库查找路径ldconfig -v|grep xxx看看有没有你的动态库。
Linux还要注意，使用System.loadLibrary(name)方法其中参数内容与Windows有区别，Linux中的的库文件名为libname.so，Windows为name.dll。
在Windows中尽量使用Windows的C/C++编译器生成dll文件，否则会出现问题。
不过具体问题还要具体对待！
java调用dl的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java调用dll找不到指定模块、java调用dl的信息别忘了在本站进行查找喔。
发布于：2022-12-01，除非注明，否则均为原创文章，转载请注明出处。