我正在开发一个动态网络项目（DWP），它有一个属性文件。创建了一个jar，它应该读取DWP中属性文件的内容以及属性文件中的更改，并将更改合并到DWP中。我无法从jar中读取属性文件。我想知道DWP中的jar如何读取DWP的属性文件
这里是jar的代码
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
public class fileReader extends Thread
{
publicstatic long oldTMS;
long currentTMS;
File file;
public static long limit;
//static String Path = "./configuration/RequestLimit.properties";
static String Path="configuration/RequestLimit.properties";
public static Properties properties;
public fileReader() throws IOException, InterruptedException {
System.out.println("Reading the property file for the first time");
Thread thread = new Thread();
setDaemon(true);
FileInputStream in = new FileInputStream(Path);
System.out.println("fd:"+in.getFD());
properties = new Properties();
properties.load(in);
String requestLimit = properties.getProperty("RequestLimit");
System.out
.println("request limit as read from the property file is ----"
+ requestLimit);
limit = Long.parseLong(properties.getProperty("RequestLimit"));
System.out.println("request limit as per the reading is ---" + limit);
start();
// waits for the thread to die
join();
}
public void run() {
System.out.println(" thread starts");
if (Thread.currentThread().isDaemon()) {
while (true) {
try {
Thread.sleep(3000);
System.out.println("entered in infinite loop");
file = new File(Path);
System.out.println("file name is --------" + file);
currentTMS = file.lastModified();
SimpleDateFormat dateFormat = new SimpleDateFormat(
"E yyyy.MM.dd 'at' hh:mm:ss a zzz");
System.out.println("file initial change time stamp:::::"
+ dateFormat.format(currentTMS));
try {
System.out
.println("lets see if the file has changed or not !!");
FileInputStream d = new FileInputStream(file);
if (oldTMS != currentTMS) {
System.out.println("checking for old and new time stamp!");
oldTMS = currentTMS;
System.out.println("file modified last at-----------"
+ oldTMS);
// reload property
try {
System.out.println("Reloading property file");
properties.load(d);
System.out.println("After Reloading property file properties : "
+ properties
.getProperty("RequestLimit"));
limit = Long.parseLong(properties
.getProperty("RequestLimit"));
System.out.println("request limit as per the reading is ---"
+ limit);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
catch (InterruptedException e2)
{
// TODO Auto-generated catch block
e2.printStackTrace();
}
}
}
}
}
像这样在DWP中使用jar
package com.ING;
import java.io.IOException;
import com.change.fileReader;
public class deamonCaller
{
public long callDeamon() throws IOException, InterruptedException
{
fileReader fr = new fileReader();
Long requestLimit =fileReader.limit;
return requestLimit;
}
}
答案 0 :(得分：1)
请尝试使用以下代码。我希望，它会帮助你很多。
static String Path="configuration/RequestLimit.properties";
loadProperties(Path);
private void loadProperties(String propertiesName) {
if (properties != null) {
return;
}
// Properties properties = null;
InputStream inputStream = null;
inputStream = this.getClass().getResourceAsStream(propertiesName);
if (inputStream == null) {
throw new Exception(propertiesName + "something");
}
properties = new Properties();
try {
properties.load(inputStream);
} catch (IOException e) {
throw new Exception(e);
}
}
答案 1 :(得分：0)
将路径作为-Dproperty = .....提供给java nad然后从那里读取而不是硬编码该值。
答案 2 :(得分：0)
对于那些可能像我一样被卡住的人来说。这对我来说是一个意外之灾。当一个想法点击我的头，实施并且它起作用时，解释了对老年人的问题..无论如何，这是一个解决方案。
将Propertyfile直接放在Web内容中，无需将文件放在动态Web项目的文件夹中。在Dynamic Web proj（DWP）的Servelet中，使用以下代码行：
String pathPropertyFile = request.getSession().getServletContext()
.getRealPath("")
+ "\\RequestLimit.properties";
System.out.println("path of the property file is"+pathforFileReader);
传递此路径获取的＆＃34; pathPropertyFile＆＃34;到具有读取属性文件的代码的jar的类。 我使用了Bean类，在beann中设置路径，然后从bean中获取路径并将其传递给读取属性文件的JAR类的方法。
public class deamonCaller {
public long callDeamon(Tao tao) throws IOException, InterruptedException {
// obtain the path from the bean Tao
String Path = tao.getPath();
System.out.println("path in deamon:" + Path);
// call the jar method while passing PATH as a parameter
fileReader fr = new fileReader(Path);
Long requestLimit = fileReader.limit;
return requestLimit;
}
}
文件阅读器的代码
package com.change;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
public class fileReader extends Thread {
static long oldTMS;
long currentTMS;
File file;
public static long limit;
//static String Path = "./configuration/RequestLimit.properties";
public static String pathName;
public static Properties properties;
public fileReader(String Path) throws IOException, InterruptedException {
pathName=Path;
System.out.println("Reading the property file for the first time");
Thread thread = new Thread();
setDaemon(true);
FileInputStream in = new FileInputStream(pathName);
System.out.println("fd:"+in.getFD());
properties = new Properties();
properties.load(in);
String requestLimit = properties.getProperty("RequestLimit");
System.out
.println("request limit as read from the property file is ----"
+ requestLimit);
limit = Long.parseLong(properties.getProperty("RequestLimit"));
System.out.println("request limit as per the reading is ---" + limit);
start();
// waits for the thread to die
join();
}
public void run() {
System.out.println(" thread starts");
if (Thread.currentThread().isDaemon()) {
while (true) {
try {
Thread.sleep(3000);
System.out.println("entered in infinite loop");
file = new File(pathName);
System.out.println("file name is --------" + file);
currentTMS = file.lastModified();
SimpleDateFormat dateFormat = new SimpleDateFormat(
"E yyyy.MM.dd 'at' hh:mm:ss a zzz");
System.out.println("file initial change time stamp:::::"
+ dateFormat.format(currentTMS));
try {
System.out
.println("lets see if the file has changed or not !!");
FileInputStream d = new FileInputStream(file);
if (oldTMS != currentTMS) {
System.out
.println("checking for old and new time stamp!");
oldTMS = currentTMS;
System.out
.println("file modified last at-----------"
+ oldTMS);
// reload property
try {
System.out.println("Reloading property file");
properties.load(d);
System.out
.println("After Reloading property file properties : "
+ properties
.getProperty("RequestLimit"));
limit = Long.parseLong(properties
.getProperty("RequestLimit"));
System.out
.println("request limit as per the reading is ---"
+ limit);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (InterruptedException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
}
}
}
}