[英]How to call a Java program from a Clojure program ?
package javaCodes;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
public class interm3parse {
public static boolean checkGroup(String str)throws IOException
{
FileInputStream fis = new FileInputStream(path);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String line = null;
while((line=br.readLine())!=null)
{
if(line.contains(str))
{
return true;
}
}
br.close();
return false;
}
public static boolean checkPresence(String str) throws IOException
{
FileInputStream fis = new FileInputStream(filepath);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String line = null;
while((line=br.readLine())!=null)
{
if(line.startsWith(str))
{
return true;
}
}
br.close();
return false;
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
PrintWriter pw = new PrintWriter(new FileWriter("filepath"));
FileInputStream fis = new FileInputStream("filepath");
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String line = null;
StringBuilder sb = new StringBuilder();
String s=new String();
while ((line = br.readLine()) != null)
{
s="";
if(!line.startsWith("defmeasure")||(line==null))
{
String[] splitArray = line.split("\\s");
s=s+splitArray[0];
//System.out.println(splitArray[0]);
for(int i=1;i<splitArray.length;i++)
{
if(splitArray[i].contains("/"))
{
String[] alias = splitArray[i].split("/");
if(checkPresence(alias[1])||checkGroup(alias[1]))
{
s=s+" "+alias[1];
}
}
else
{
s=s+" "+splitArray[i];
}
}
pw.write(s);
pw.println();
System.out.println(s);
}
else
{
//fw.write(line);
//fw.write("\n");
System.out.println(line);
pw.write(line);
pw.println();
}
}
pw.flush();
pw.close();
}//main
}//end of class
我有一個用戶定義的Java程序(interm3parse.java);我想從clojure程序中調用該程序(函數)....兩個代碼都可以單獨正常工作..Java代碼在javaCodes包中... ......... clojure代碼在另一個命名空間中........................... ......
Clojure code
(ns javaCodes.generalizedmeasuretocomp )
(defn output-Measure-Criterias-Final []
;;;Java program to replace all group components and remove aliases
)
您可以從Clojure調用Java代碼 (假設Java代碼類位於Clojure應用程序的類路徑中):
當Java類定義靜態方法時,您可以這樣調用它們:
(ns javaCodes.generalizedmeasuretocomp
(:import javaCodes.interm3parse))
(defn output-Measure-Criterias-Final []
(javaCodes.interm3parse/checkGroup "some string"))
順便說一句,我注意到您的Java代碼可能無法正確運行(但我想它僅是出於說明目的)。 它使用一些未定義的名稱(例如filepath
),並且可能會泄漏資源(返回true
時,它不會關閉輸入流)。
我認為您應該將資源包裝到try-with-resources
語句中,或者使用with-open
在Clojure中編寫該代碼:
(defn file-line-starts-with-str? [filename s]
(with-open [reader (clojure.java.io/reader filename)]
(->> reader
(line-seq)
(some #(clojure.string/starts-with? % s)))))
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