如何获取树莓派cpu温度、cpu使用率、内存使用率

这篇文章给大家分享的是有关如何获取树莓派cpu温度、cpu使用率、内存使用率的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

代码片段：

<%@ page language="java" pageEncoding="utf-8" import="java.io.BufferedReader, java.io.FileReader, java.util.*"%><%--statebar info start--%>        <%--            -function:get memery usage            -method:(read /proc/meminfo)            -calculation:                total memery = MemTotal                mem free = MemFree + Buffers + Cached                mem usage = MemTotal - mem free        --%>        <%            FileReader fr_mem_usage=new FileReader("/proc/meminfo");            BufferedReader br_mem_usage=new BufferedReader(fr_mem_usage);            String s_mem_total=br_mem_usage.readLine();            String s_mem_free=br_mem_usage.readLine();            String s_mem_buffers=br_mem_usage.readLine();            String s_mem_cached=br_mem_usage.readLine();            String[] s_mem_total_array = s_mem_total.split("\\s+");            String[] s_mem_free_array = s_mem_free.split("\\s+");            String[] s_mem_buffers_array = s_mem_buffers.split("\\s+");            String[] s_mem_cached_array = s_mem_cached.split("\\s+");                        int mem_total = Integer.parseInt(s_mem_total_array[1]);            int mem_free = Integer.parseInt(s_mem_free_array[1]);            int mem_buffers = Integer.parseInt(s_mem_buffers_array[1]);            int mem_cached = Integer.parseInt(s_mem_cached_array[1]);            int memUsage = 100 - (100 * (mem_free + mem_buffers + mem_cached) / mem_total);            fr_mem_usage.close();            br_mem_usage.close();        %>                <%--            -function:get cpu usage            -method:(read /proc/stat)            -calculation:                CPU total time=user+nice+system+idle+iowait+irq+softirq                cpu usage=(idle2-idle1)/(cpu2-cpu1)*100                OR cpu usage=[(user_2 +sys_2+nice_2) - (user_1 + sys_1+nice_1)]/(total_2 - total_1)*100        --%>        <%            FileReader fr_cpu_usage1=new FileReader("/proc/stat");            BufferedReader br_cpu_usage1=new BufferedReader(fr_cpu_usage1);            String s_cpu_usage1=br_cpu_usage1.readLine();            String[] s_cpu_usage_array1 = s_cpu_usage1.split("\\s+");            int f_cpu_usage_array1[] = new int[7];            for(int i=1;i<=7;i++){                f_cpu_usage_array1[i-1] = Integer.parseInt(s_cpu_usage_array1[i]);            }            fr_cpu_usage1.close();            br_cpu_usage1.close();            Thread.sleep(100);                          FileReader fr_cpu_usage2=new FileReader("/proc/stat");            BufferedReader br_cpu_usage2=new BufferedReader(fr_cpu_usage2);            String s_cpu_usage2=br_cpu_usage2.readLine();            String[] s_cpu_usage_array2 = s_cpu_usage2.split("\\s+");            int f_cpu_usage_array2[] = new int[7];            for(int i=1;i<=7;i++){                f_cpu_usage_array2[i-1] = Integer.parseInt(s_cpu_usage_array2[i]);            }            fr_cpu_usage2.close();            br_cpu_usage2.close();            int cputotal1=0,cputotal2=0,idle1=0,idle2=0,cpuUsage=0;            for(int i=0;i<=6;i++){                cputotal1 = cputotal1 + f_cpu_usage_array1[i];            }            for(int i=0;i<=6;i++){                cputotal2 = cputotal2 + f_cpu_usage_array2[i];            }            idle1 = f_cpu_usage_array1[3];                   idle2 = f_cpu_usage_array2[3];            cpuUsage = 100 - (100 * (idle2 - idle1)/(cputotal2 - cputotal1));        %>                <%--            -function:get cpu temperature            -method:(read /sys/class/thermal/thermal_zone0/temp)            -calculation:                actual temperature = number_you_read / 1000        --%>        <%            FileReader fr=new FileReader("/sys/class/thermal/thermal_zone0/temp");            BufferedReader br=new BufferedReader(fr);            String s=br.readLine();            int temp = (Integer.parseInt(s))/1000;            fr.close();            br.close();        %>                <%--statebar info end--%>

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