1.我想实现的功能是在java程序中导入HttpURLConnection类，然后将函数的值作为post方法要提交的参数，最后显示在显示台上。
2.要用到的函数是自己写的可以显示实时计算机cpu、内存、硬盘利用率的一个方法，返回值是String.
3.这是调用HttpURLConnection的代码
> package com.httpclient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import .HttpURLConnection;
import .URL;
import agent.WindowsInfoUtil;
public class HttpURLConnectionTest {
//发送一个POST请求,参数形式key1=value1&key2=value2...
public static String post(String path,String params) throws Exception{
HttpURLConnection httpConn=null;
BufferedReader in=null;
PrintWriter out=null;
try {
URL url=new URL(path);
httpConn=(HttpURLConnection)url.openConnection();
httpConn.setRequestMethod("POST");
httpConn.setDoInput(true);
httpConn.setDoOutput(true);
//发送post请求参数
out=new PrintWriter(httpConn.getOutputStream());
out.println(params);
out.flush();
//读取响应
if(httpConn.getResponseCode()==HttpURLConnection.HTTP_OK){
StringBuffer content=new StringBuffer();
String tempStr="";
in=new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
while((tempStr=in.readLine())!=null){
content.append(tempStr);
}
return content.toString();
}else{
throw new Exception("请求出现了问题!");
}
} catch (IOException e) {
e.printStackTrace();
}finally{
in.close();
out.close();
httpConn.disconnect();
}
return null;
}
public static void main(String[] args) throws Exception {
String resMessage=HttpURLConnectionTest.post("http://localhost:8888/test.jsp", "CPU=20&MEMORY=40&DISK=50");//想实现将函数返回值作为参数但是不知道该怎么弄？
System.out.println(resMessage);
}
}
4.另一个显示cpu、内存、硬盘利用率的函数如下：
package agent;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.List;
import com.sun.management.OperatingSystemMXBean;
public class WindowsInfoUtil {
private static final int CPUTIME = 500;
private static final int PERCENT = 100;
private static final int FAULTLENGTH = 10;
public static void main(String[] args) throws FileNotFoundException {
System.out.println(getCpuRatioForWindows());
System.out.println(getMemery());
System.out.println(getDisk());
}
// 获取内存使用率
public static String getMemery() {
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
// 总的物理内存+虚拟内存
long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();
// 剩余的物理内存
long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
Double compare = (Double) (1 - freePhysicalMemorySize * 1.0
/ totalvirtualMemory) * 100;
String str = "内存已使用:" + compare.intValue() + "%";
return str;
}
// 获取文件系统使用率
public static List<String> getDisk() {
// 操作系统
List<String> list = new ArrayList<String>();
for (char c = 'A'; c <= 'Z'; c++) {
String dirName = c + ":/";
File win = new File(dirName);
if (win.exists()) {
long total = (long) win.getTotalSpace();
long free = (long) win.getFreeSpace();
Double compare = (Double) (1 - free * 1.0 / total) * 100;
String str = c + ":盘 已使用 " + compare.intValue() + "%";
list.add(str);
}
}
return list;
}
// 获得cpu使用率
public static String getCpuRatioForWindows() {
//...
}
}
5.我想知道如何能够将函数的返回值作为post提交的参数，谢谢。
将返回数据组织好，无论以XML还是JSON 还是其它数据传输形式。
让页面用AJAX请求你的servlet，servlet里面就是你的方法，将返回值返回给调用的前端AJAX，前端拿到你的数据再做处理就可以了。
