Java动态内存占用

Java动态内存占用

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Version : 1.0
 * @Author : lihao
 * @Date : 2022/6/13 11:49
 **/
public class Test11 {

    /**
     * 处理内存
     */
    public static void handleNc(){
        String filePath = "D:/data/aa";  //文件路径
        int memValue = 1024;  //判断基准：1024M
        String strAdd = "";  //长度增加的字符串
        int rssValue = getRssValue(filePath);  //获取rss的值

        while(rssValue < memValue){
            int diffValue = memValue - rssValue;  //差值M：diffValue兆
            //生成“差值M”的字符串
            StringBuilder strb = new StringBuilder();
            for(int i=0; i<1024*1024*diffValue; i++){
                strb.append('a'+"");
            }
            strAdd = strb.toString();  //当前需要增加的长度为“差值M”的字符串
        }
    }

    /**
     * 获取rss配置的值
     */
    public static int getRssValue(String filePath){
        int rssValue = 0;  //rss的值

        //以行为单位读取文件，读取到最后一行
        BufferedReader reader = null;
        List<String> listContent = new ArrayList<>();
        try {
            reader = new BufferedReader(new FileReader(filePath));
            String tempString = null;
            int line = 1;
            // 一次读入一行，直到读入null为文件结束
            while ((tempString = reader.readLine()) != null) {
                listContent.add(tempString);
                line++;
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                }
            }
        }

        for(String prostr : listContent){
            if(prostr.contains("rss")){
                rssValue = Integer.valueOf(prostr.replace("rss ",""));
            }
        }
        return rssValue;
    }

}

---

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Version : 1.0
 * @Author : lihao
 * @Date : 2022/6/13 11:49
 **/
public class GetRssValueAndHandleMem {

    /**
     * 处理内存
     */
    public static String handleNc(){
        String filePath = "D:/data/123.txt";  //文件路径
        long memValue = 10;  //判断基准：1024M
        String strAdd = "";  //长度增加的字符串
        long rssValue = getRssValue(filePath);  //获取rss的值

        int num = 0;
        memValue = memValue*1024*1024;
        while(rssValue < memValue){
//            System.out.println("第" + num +"次---------" + rssValue);
            //生成“1M”的字符串
            StringBuilder strb = new StringBuilder();
            for(int i=0; i<102400; i++){
                strb.append("aaaaaaaaaa");
            }
            strAdd = strb.toString();

            rssValue = getRssValue(filePath); //获取最新的rss的值
        }
        return strAdd;
    }

    /**
     * 获取rss配置的值
     */
    public static long getRssValue(String filePath){
        long rssValue = 0;  //rss的值

        //以行为单位读取文件，读取到最后一行
        BufferedReader reader = null;
        List<String> listContent = new ArrayList<>();
        try {
            reader = new BufferedReader(new FileReader(filePath));
            String tempString = null;
            int line = 1;
            // 一次读入一行，直到读入null为文件结束
            while ((tempString = reader.readLine()) != null) {
                listContent.add(tempString);
                line++;
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                }
            }
        }

        for(String prostr : listContent){
            if(prostr.startsWith("rss ")){
                rssValue = Long.valueOf(prostr.replace("rss ",""));
            }
        }
        return rssValue;
    }

}

---

public class TestRun {

    public static void main(String[] args) {

//        String filePath = "D:/data/123.txt";
//        long rssValue = GetRssValueAndHandleMem.getRssValue(filePath);
//        System.out.println(rssValue);


        //处理xxxx

        String s = GetRssValueAndHandleMem.handleNc();

        System.out.println(s);


    }
}