GeekHubJava4WebThursday · AndreyChervonyuk · Jan 3, 2016
diff --git a/src/com/geekhub/hw8/CreateFileServlet.java b/src/com/geekhub/hw8/CreateFileServlet.java
@@ -6,12 +6,30 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 @WebServlet("/file/create")
 public class CreateFileServlet extends HttpServlet {
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        super.doGet(req, resp);
+        String filePath = req.getParameter("path") + "\\" + req.getParameter("fileName");
+        String type = req.getParameter("type");
+
+        try {
+            switch (type) {
+                case  "file" :
+                    Files.createFile(Paths.get(filePath));
+                    break;
+                case "directory" :
+                    Files.createDirectories(Paths.get(filePath));
+                    break;
+            }
+        } catch (Exception e) {
+            req.setAttribute("message", "Error create new file " + e.getClass().getSimpleName());
+        }
+
+        req.getRequestDispatcher("/dir/view?path=" + req.getParameter("path")).forward(req, resp);
     }
 }
diff --git a/src/com/geekhub/hw8/RemoveFileServlet.java b/src/com/geekhub/hw8/RemoveFileServlet.java
@@ -6,12 +6,55 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import java.nio.file.*;
+import java.nio.file.attribute.BasicFileAttributes;
 
 @WebServlet("/file/remove")
 public class RemoveFileServlet extends HttpServlet {
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        super.doGet(req, resp);
+        Path path = null;
+        String message;
+
+        try {
+            path = Paths.get(req.getParameter("path"));
+            if(Files.isDirectory(path)) {
+                deleteDirectory(path);
+            } else {
+                Files.delete(path);
+            }
+            message = path.toString() + " deleted";
+        } catch (FileSystemException e) {
+            message = "Error delete file";
+        } catch (NullPointerException e) {
+            message = "Error delete file";
+            path = Paths.get("/");
+        }
+
+        req.setAttribute("message", message.replace("\\", "/"));
+        req.getRequestDispatcher("/dir/view?path=" + path.getParent()).forward(req, resp);
+    }
+
+    private void deleteDirectory(Path path) throws IOException {
+        Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
+
+            @Override
+            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+                if(exc == null) {
+                    Files.delete(dir);
+                    return FileVisitResult.CONTINUE;
+                } else {
+                    throw exc;
+                }
+            }
+
+            @Override
+            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                Files.delete(file);
+                return FileVisitResult.CONTINUE;
+            }
+        });
+
     }
 }
diff --git a/src/com/geekhub/hw8/ViewDirectoryServlet.java b/src/com/geekhub/hw8/ViewDirectoryServlet.java
@@ -1,5 +1,7 @@
 package com.geekhub.hw8;
 
+import com.geekhub.hw8.file.FileInformation;
+
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebInitParam;
@@ -9,9 +11,9 @@
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.nio.file.*;
+import java.util.ArrayList;
+import java.util.List;
 
 @WebServlet(value = "/dir/view", initParams = {
     @WebInitParam(name = "root", value = "D:\\")
@@ -27,16 +29,47 @@ public void init(ServletConfig config) throws ServletException {
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        StringBuilder sb = new StringBuilder();
-        sb.append("<html>");
+        Path currentPath;
+        req.setCharacterEncoding(StandardCharsets.UTF_8.name());
+        String path = req.getParameter("path");
+
+        if (path == null || path.equals("null")) {
+            currentPath = ROOT_PATH;
+        } else {
+            currentPath = Paths.get(path);
+        }
 
-        //TODO: Implement directory listing here
+        if (Files.exists(currentPath)) {
+            req.setAttribute("fileList", createFileList(currentPath));
+            req.setAttribute("currentPath", currentPath);
+            req.getRequestDispatcher("/WEB-INF/pages/fileList.jsp").forward(req, resp);
+        } else {
+            req.setAttribute("message", "File: " + currentPath.toString().replace("\\", "/") + " not found");
+            req.getRequestDispatcher("/dir/view?path=" + getLastExistDirectory(currentPath)).forward(req, resp);
+        }
+    }
 
-        sb.append("</html>");
-        resp.getWriter().write(sb.toString());
+    private List<FileInformation> createFileList(Path path) {
+        List<FileInformation> fileList = new ArrayList<>();
+        try (DirectoryStream<Path> stream = Files.newDirectoryStream(path)) {
+            for (Path filePath : stream) {
+                fileList.add(new FileInformation(filePath));
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return  fileList;
     }
 
-    private void appendLink(StringBuilder sb, String text, Path path) {
-        //TODO: Implement link rendering based on path type (directory or file)
+    private Path getLastExistDirectory(Path path) {
+        while(path != null) {
+            path = path.getParent();
+            if (Files.exists(path) & Files.isDirectory(path)) {
+                break;
+            }
+        }
+        return path;
     }
+
+
 }
diff --git a/src/com/geekhub/hw8/ViewFileServlet.java b/src/com/geekhub/hw8/ViewFileServlet.java
@@ -5,14 +5,42 @@
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedReader;
 import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.Paths;
 
 @WebServlet("/file/view")
 public class ViewFileServlet extends HttpServlet {
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        super.doGet(req, resp);
+        Path path = null;
+
+        try {
+            path = Paths.get(req.getParameter("path"));
+            req.setAttribute("backLink", path.getParent());
+            req.setAttribute("content", readFile(path));
+            req.getRequestDispatcher("/WEB-INF/pages/fileContent.jsp").forward(req, resp);
+        } catch (IOException e) {
+            req.setAttribute("message", "Error read file ");
+            req.getRequestDispatcher("/dir/view?path=" + path.getParent()).forward(req, resp);
+        } catch (NullPointerException e) {
+            req.setAttribute("message", "Not selected file");
+            req.getRequestDispatcher("/dir/view").forward(req, resp);
+        }
+    }
+
+    private static String readFile(Path path) throws IOException {
+        StringBuilder content = new StringBuilder();
+        try(BufferedReader reader = Files.newBufferedReader(path, Charset.defaultCharset())) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                content.append(line).append(System.lineSeparator());
+            }
+        }
+        return content.toString();
     }
 }
diff --git a/src/com/geekhub/hw8/file/FileInformation.java b/src/com/geekhub/hw8/file/FileInformation.java
@@ -0,0 +1,32 @@
+package com.geekhub.hw8.file;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class FileInformation {
+    private String name;
+    private String path;
+    private Type type;
+
+    public FileInformation(Path path) {
+        this.name = path.getFileName().toString();
+        this.path = path.toString();
+        if (Files.isDirectory(path)) {
+            this.type = Type.DIRECTORY;
+        } else {
+            this.type = Type.FILE;
+        }
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public Type getType() {
+        return type;
+    }
+}
diff --git a/src/com/geekhub/hw8/file/Type.java b/src/com/geekhub/hw8/file/Type.java
@@ -0,0 +1,5 @@
+package com.geekhub.hw8.file;
+
+public enum Type {
+    FILE, DIRECTORY
+}
diff --git a/web/WEB-INF/pages/fileContent.jsp b/web/WEB-INF/pages/fileContent.jsp
@@ -0,0 +1,16 @@
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title></title>
+</head>
+<body>
+
+  <textarea cols="150" rows="30">
+    ${content}
+  </textarea><br>
+
+  Back to: <a href="/dir/view?path=${backLink}" > ${backLink}</a>
+
+</body>
+</html>
diff --git a/web/WEB-INF/pages/fileList.jsp b/web/WEB-INF/pages/fileList.jsp
@@ -0,0 +1,57 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<html>
+<head>
+    <title></title>
+    <style type="text/css">
+        table, td{
+            border: 2px solid black;
+            border-collapse: collapse;
+        }
+    </style>
+</head>
+<body>
+
+    <p>Current path: ${currentPath}</p>
+
+    <c:if test="${not empty currentPath.parent}">
+        <p>
+            Back to: <a href="/dir/view?path=${currentPath.parent}" > ${currentPath.parent}</a>
+        </p>
+    </c:if>
+
+    <form action="/file/create">
+        <input type=hidden name=path value="${currentPath}">
+        <label for="new_file">Create new</label>
+        <input type=text name=fileName placeholder="name" id="new_file"><br>
+        <label for="file">File</label>
+        <input type="radio" name="type" value="file" id="file" checked><br>
+        <label for="directory">Directory</label>
+        <input type="radio" name="type" value="directory" id="directory"><br>
+        <input type=submit value=Create>
+    </form>
+
+   <table>
+      <c:forEach items="${fileList}" var="file">
+          <tr>
+              <c:choose>
+                  <c:when test="${file.type == 'FILE'}">
+                      <td><a href="/file/view?path=${file.path}" >${file.name}</a></td>
+                  </c:when>
+                  <c:when test="${file.type == 'DIRECTORY'}">
+                      <td><a href="/dir/view?path=${file.path}" > ${file.name} </a></td>
+                  </c:when>
+              </c:choose>
+              <td><a href="/file/remove?path=${file.path}" >Delete</a></td>
+          </tr>
+      </c:forEach>
+   </table>
+
+  <c:if test="${not empty message}">
+      <script>
+          alert("${message}")
+      </script>
+  </c:if>
+
+</body>
+</html>