站点更新：2017-12-21 17:18:54

src/main/java/me/ehlxr/ContentReplace2.java

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+package me.ehlxr;
+
+import java.io.*;
+
+@SuppressWarnings("ALL")
+public class ContentReplace2 {
+    public static void main(String[] args) {
+        File file = new File("/Users/ehlxr/ehlxr/blog/hugoBlog/content/post");
+        File[] files = file.listFiles();
+
+        for (File f : files) {
+            operationFile(f);
+        }
+    }
+
+    private static void operationFile(File file) {
+        File tmpfile = new File(file.getParentFile().getAbsolutePath() + "\\" + file.getName() + ".tmp");
+        try (
+                BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
+                BufferedWriter writer = new BufferedWriter(new FileWriter(tmpfile))) {
+
+            boolean flag = false;
+            String line;
+            while ((line = reader.readLine()) != null) {
+
+                if (line.startsWith("title")) {
+                    System.out.println(line);
+                    // StringBuilder sb = new StringBuilder();
+                    // line = sb.append("title: \"").append(line.substring(line.indexOf("title") + 7)).append("\"").toString();
+                    line = line.replaceAll("'", "");
+                    System.out.println(line);
+
+                    flag = true;
+                }
+                writer.write(line + "\n");
+            }
+
+            if (flag) {
+                file.delete();
+                tmpfile.renameTo(new File(file.getAbsolutePath()));
+            } else {
+                tmpfile.delete();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/me/ehlxr/DumpStack.java

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+package me.ehlxr;
+
+import java.io.*;
+import java.lang.management.*;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Code which writes a stack dump for all threads to a file.
+ */
+public class DumpStack {
+
+    // directory where the stack files are written
+    private static final String STACK_DUMP_DIR = "/var/tmp";
+
+    // here for testing
+    public static void main(String[] args) throws Exception {
+        dumpStacks();
+    }
+
+    private static void dumpStacks() throws IOException {
+        ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
+        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
+        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
+
+
+        ThreadInfo[] threadInfos = mxBean.getThreadInfo(mxBean.getAllThreadIds(), 0);
+        Map<Long, ThreadInfo> threadInfoMap = new HashMap<>();
+        for (ThreadInfo threadInfo : threadInfos) {
+            threadInfoMap.put(threadInfo.getThreadId(), threadInfo);
+        }
+
+        // choose our dump-file
+        File dumpFile = new File(STACK_DUMP_DIR, "stacks." + System.currentTimeMillis());
+        try (Writer writer = new BufferedWriter(new FileWriter(dumpFile))) {
+            dumpTraces(mxBean, threadInfoMap, writer);
+        }
+    }
+
+    private static void dumpTraces(ThreadMXBean mxBean, Map<Long, ThreadInfo> threadInfoMap, Writer writer)
+            throws IOException {
+        Map<Thread, StackTraceElement[]> stacks = Thread.getAllStackTraces();
+        writer.write("Dump of " + stacks.size() + " thread at "
+                + new SimpleDateFormat("yyyy/MM/dd HH:mm:ss z").format(new Date(System.currentTimeMillis())) + "\n\n");
+        for (Map.Entry<Thread, StackTraceElement[]> entry : stacks.entrySet()) {
+            Thread thread = entry.getKey();
+            writer.write("\"" + thread.getName() + "\" prio=" + thread.getPriority() + " tid=" + thread.getId() + " "
+                    + thread.getState() + " " + (thread.isDaemon() ? "deamon" : "worker") + "\n");
+            ThreadInfo threadInfo = threadInfoMap.get(thread.getId());
+            if (threadInfo != null) {
+                writer.write("    native=" + threadInfo.isInNative() + ", suspended=" + threadInfo.isSuspended()
+                        + ", block=" + threadInfo.getBlockedCount() + ", wait=" + threadInfo.getWaitedCount() + "\n");
+                writer.write("    lock=" + threadInfo.getLockName() + " owned by " + threadInfo.getLockOwnerName()
+                        + " (" + threadInfo.getLockOwnerId() + "), cpu="
+                        + (mxBean.getThreadCpuTime(threadInfo.getThreadId()) / 1000000L) + ", user="
+                        + (mxBean.getThreadUserTime(threadInfo.getThreadId()) / 1000000L) + "\n");
+            }
+            for (StackTraceElement element : entry.getValue()) {
+                writer.write("        ");
+                writer.write(element.toString());
+                writer.write("\n");
+            }
+            writer.write("\n");
+        }
+    }
+}

src/main/java/me/ehlxr/Modify.java

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+package me.ehlxr;
+
+import java.io.*;
+
+/*
+ * 替换文件（如果该文件含有子目录，则包括子目录所有文件）中某个字符串并写入新内容（Java代码实现）.
+ *
+ *原理：逐行读取源文件的内容，一边读取一边同时写一个*.tmp的文件。
+ *当读取的行中发现有需要被替换和改写的目标内容‘行’时候，用新的内容‘行’替换之。
+ *最终，删掉源文件，把*.tmp的文件重命名为源文件名字。
+ *
+ *注意！代码功能是逐行读取一个字符串，然后检测该字符串‘行’中是否含有替换的内容，有则用新的字符串‘行’替换源文件中该处整个字符串‘行’。没有则继续读。
+ *注意！替换是基于‘行’，逐行逐行的替换！
+ *
+ * */
+public class Modify {
+
+    private final String target;
+    private final String newContent;
+    private String path;
+
+    public Modify(String path, String target, String newContent) {
+        // 操作目录。从该目录开始。该文件目录下及其所有子目录的文件都将被替换。
+        this.path = path;
+        // target:需要被替换、改写的内容。
+        this.target = target;
+        // newContent:需要新写入的内容。
+        this.newContent = newContent;
+
+        operation();
+    }
+
+    public static void main(String[] args) {
+        //代码测试：假设有一个test文件夹，test文件夹下含有若干文件或者若干子目录，子目录下可能也含有若干文件或者若干子目录（意味着可以递归操作）。
+        //把test目录下以及所有子目录下（如果有）中文件含有"hi"的字符串行替换成新的"hello,world!"字符串行。
+        new Modify("/Users/ehlxr/WorkSpaces/java-utils/src/main/java/me/ehlxr/test.txt", "hi", "hello,world!");
+    }
+
+    private void operation() {
+        File file = new File(path);
+        opeationDirectory(file);
+    }
+
+    private void opeationDirectory(File file) {
+        if (file.isFile()) {
+            operationFile(file);
+        }
+        if (file.isDirectory()) {
+            File[] files = file.listFiles();
+            if (files != null) {
+                for (File f : files) {
+                    opeationDirectory(f);
+                }
+            }
+        }
+
+    }
+
+    private void operationFile(File file) {
+
+        try {
+            InputStream is = new FileInputStream(file);
+            BufferedReader reader = new BufferedReader(
+                    new InputStreamReader(is));
+
+            String filename = file.getName();
+            // tmpfile为缓存文件，代码运行完毕后此文件将重命名为源文件名字。
+            File tmpfile = new File(file.getParentFile().getAbsolutePath() + "\\" + filename + ".tmp");
+
+            BufferedWriter writer = new BufferedWriter(new FileWriter(tmpfile));
+
+            boolean flag = false;
+            String str;
+            while (true) {
+                str = reader.readLine();
+
+                if (str == null)
+                    break;
+
+                if (str.contains(target)) {
+                    writer.write(newContent + "\n");
+
+                    flag = true;
+                } else
+                    writer.write(str + "\n");
+            }
+
+            is.close();
+
+            writer.flush();
+            writer.close();
+
+            if (flag) {
+                file.delete();
+                tmpfile.renameTo(new File(file.getAbsolutePath()));
+            } else {
+                tmpfile.delete();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/me/ehlxr/test.txt

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+hello,world!
+hello,world!