在Java中调用C++
在java中调用自己的c++代码是一件简单的事情,以下类为例:
class Prompt {
private native String getLine(String prompt);
public static void main(String args[]) {
Prompt p = new Prompt();
String input = p.getLine("Type a line: ");
System.out.println("User typed: " + input);
}
static {
System.loadLibrary("MyImpOfPrompt");
}
}
我们希望在Prompt类中可以调用c++下的getLine函数,第一步就是先编译该java文件:
javac Prompt.java
此时应该已经生成了Prompt.class文件,然后使用命令:
javah -jni Prompt
即可生成相应的.h文件,其内容为:
JNIEXPORT jstring JNICALL
Java_Prompt_getLine(JNIEnv *, jobject, jstring);
事实上Java调用c++只需要满足一个接口命名规范即可,而javah -jni命令则为快速生成接口提供了方便。
最后,记得将你的c++代码编译为libMyImpOfPrompt.so
更详细的规范及操作可以参见
http://journals.ecs.soton.ac.uk/java/tutorial/native1.1/implementing/index.html
相关文档:
import java.io.*;
public class FileReaderSample {
public static void main(String args[]) throws IOException
{
// 建立可容纳1024个字符的数组
char data[]=new char[1024];
// 建立对象fr
FileReader fr= ......
import java.io.*;
public class FileWrite {
public static void main(String args[]) {
String outPut = "C:\\bin";
StringBuffer ab = new StringBuffer();
for(int i=6;i<=30;i++){
ab.append("http://www.test.com/joke/index_"+i+".htm\r\n&qu ......
处理乱码问题
1、规范数据库和页面所有编码统一为一种例如utf-8
2、hibernate连接数据库设置连接编码
<session-factory>
<property name="connection.url">
jdbc:mysql://127.0.0.1:3306/leaveword?useUnicode=true&characterEncoding=utf-8
& ......
import java.io.*;
import java.lang.String;
public class Switchover {
public static String[] strChi = {"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
public static String[] strUnits = {"","","拾","佰","仟","万","拾","佰","仟","亿","拾","佰","仟","兆","拾","佰","仟","角","分"};
//验证输 ......
网址: http://blog.csdn.net/justinavril/archive/2008/08/06/2775767.aspx
import
java.io.*;
public
class
FileToString {
public
static
String readFile(String fileName)  ......