https://tree.taiga.io/project/jr-utily-grog-v3/us/195 Mettre en place une connexion h2 via servlet

+package org.legrog.util;
+// Code copied from org.h2.server.web.ConnectionInfo
+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
+//package org.h2.server.web;
+
+        import org.h2.util.MathUtils;
+        import org.h2.util.StringUtils;
+
+/**
+ * The connection info object is a wrapper for database connection information
+ * such as the database URL, user name and password.
+ * This class is used by the H2 Console.
+ */
+public class ConnectionInfo implements Comparable<ConnectionInfo> {
+    /**
+     * The driver class name.
+     */
+    public String driver;
+
+    /**
+     * The database URL.
+     */
+    public String url;
+
+    /**
+     * The user name.
+     */
+    public String user;
+
+    /**
+     * The connection display name.
+     */
+    String name;
+
+    /**
+     * The last time this connection was used.
+     */
+    int lastAccess;
+
+    ConnectionInfo() {
+        // nothing to do
+    }
+
+    public ConnectionInfo(String data) {
+        String[] array = StringUtils.arraySplit(data, '|', false);
+        name = get(array, 0);
+        driver = get(array, 1);
+        url = get(array, 2);
+        user = get(array, 3);
+    }
+
+    private static String get(String[] array, int i) {
+        return array != null && array.length > i ? array[i] : "";
+    }
+
+    String getString() {
+        return StringUtils.arrayCombine(new String[] { name, driver, url, user }, '|');
+    }
+
+    @Override
+    public int compareTo(ConnectionInfo o) {
+        return -MathUtils.compareInt(lastAccess, o.lastAccess);
+    }
+
+}
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+package org.legrog.util;
+
+import javax.servlet.annotation.WebServlet;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.Properties;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.h2.engine.Constants;
+import org.h2.server.web.PageParser;
+import org.h2.util.New;
+
+
+@WebServlet(urlPatterns="/console/*", name="H2Console", loadOnStartup=1)
+public class H2ConsoleServlet extends HttpServlet {
+// Code copied from org.h2.server.web.WebServlet
+    private static final long serialVersionUID = 1L;
+    private transient WebServer server;
+
+    @Override
+    public void init() {
+        ServletConfig config = getServletConfig();
+        Enumeration<?> en = config.getInitParameterNames();
+        ArrayList<String> list = New.arrayList();
+        while (en.hasMoreElements()) {
+            String name = en.nextElement().toString();
+            String value = config.getInitParameter(name);
+            if (!name.startsWith("-")) {
+                name = "-" + name;
+            }
+            list.add(name);
+            if (value.length() > 0) {
+                list.add(value);
+            }
+        }
+        String[] args = new String[list.size()];
+        list.toArray(args);
+        server = new WebServer();
+        server.setAllowChunked(false);
+        server.init(args);
+    }
+
+    @Override
+    public void destroy() {
+        server.stop();
+    }
+
+    private boolean allow(HttpServletRequest req) {
+        if (server.getAllowOthers()) {
+            return true;
+        }
+        String addr = req.getRemoteAddr();
+        try {
+            InetAddress address = InetAddress.getByName(addr);
+            return address.isLoopbackAddress();
+        } catch (UnknownHostException e) {
+            return false;
+        } catch (NoClassDefFoundError e) {
+            // Google App Engine does not allow java.net.InetAddress
+            return false;
+        }
+    }
+
+    private String getAllowedFile(HttpServletRequest req, String requestedFile) {
+        if (!allow(req)) {
+            return "notAllowed.jsp";
+        }
+        if (requestedFile.length() == 0) {
+            return "index.do";
+        }
+        return requestedFile;
+    }
+
+    @Override
+    public void doGet(HttpServletRequest req, HttpServletResponse resp)
+            throws IOException {
+        req.setCharacterEncoding("utf-8");
+        String file = req.getPathInfo();
+        if (file == null) {
+            resp.sendRedirect(req.getRequestURI() + "/");
+            return;
+        } else if (file.startsWith("/")) {
+            file = file.substring(1);
+        }
+        file = getAllowedFile(req, file);
+
+        // extract the request attributes
+        Properties attributes = new Properties();
+        Enumeration<?> en = req.getAttributeNames();
+        while (en.hasMoreElements()) {
+            String name = en.nextElement().toString();
+            String value = req.getAttribute(name).toString();
+            attributes.put(name, value);
+        }
+        en = req.getParameterNames();
+        while (en.hasMoreElements()) {
+            String name = en.nextElement().toString();
+            String value = req.getParameter(name);
+            attributes.put(name, value);
+        }
+
+        WebSession session = null;
+        String sessionId = attributes.getProperty("jsessionid");
+        if (sessionId != null) {
+            session = server.getSession(sessionId);
+        }
+        WebApp app = new WebApp(server);
+        app.setSession(session, attributes);
+        String ifModifiedSince = req.getHeader("if-modified-since");
+
+        String hostAddr = req.getRemoteAddr();
+        file = app.processRequest(file, hostAddr);
+        session = app.getSession();
+
+        String mimeType = app.getMimeType();
+        boolean cache = app.getCache();
+
+        if (cache && server.getStartDateTime().equals(ifModifiedSince)) {
+            resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+            return;
+        }
+        byte[] bytes = server.getFile(file);
+        if (bytes == null) {
+            resp.sendError(HttpServletResponse.SC_NOT_FOUND);
+            bytes = ("File not found: " + file).getBytes(Constants.UTF8);
+        } else {
+            if (session != null && file.endsWith(".jsp")) {
+                String page = new String(bytes, Constants.UTF8);
+                page = PageParser.parse(page, session.map);
+                bytes = page.getBytes(Constants.UTF8);
+            }
+            resp.setContentType(mimeType);
+            if (!cache) {
+                resp.setHeader("Cache-Control", "no-cache");
+            } else {
+                resp.setHeader("Cache-Control", "max-age=10");
+                resp.setHeader("Last-Modified", server.getStartDateTime());
+            }
+        }
+        if (bytes != null) {
+            ServletOutputStream out = resp.getOutputStream();
+            out.write(bytes);
+        }
+    }
+
+    @Override
+    public void doPost(HttpServletRequest req, HttpServletResponse resp)
+            throws IOException {
+        doGet(req, resp);
+    }
+}

+package org.legrog.util;
+// Code copied from org.h2.server.web.WebSession
+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
+///package org.h2.server.web;
+
+        import java.sql.Connection;
+        import java.sql.DatabaseMetaData;
+        import java.sql.ResultSet;
+        import java.sql.SQLException;
+        import java.sql.Statement;
+        import java.sql.Timestamp;
+        import java.util.ArrayList;
+        import java.util.HashMap;
+        import java.util.Locale;
+
+        import org.h2.bnf.Bnf;
+        import org.h2.bnf.context.DbContents;
+        import org.h2.bnf.context.DbContextRule;
+        import org.h2.message.DbException;
+        import org.h2.util.New;
+import org.h2.server.web.*;
+
+/**
+ * The web session keeps all data of a user session.
+ * This class is used by the H2 Console.
+ */
+class WebSession {
+
+    private static final int MAX_HISTORY = 1000;
+
+    /**
+     * The last time this client sent a request.
+     */
+    long lastAccess;
+
+    /**
+     * The session attribute map.
+     */
+    final HashMap<String, Object> map = New.hashMap();
+
+    /**
+     * The current locale.
+     */
+    Locale locale;
+
+    /**
+     * The currently executing statement.
+     */
+    Statement executingStatement;
+
+    /**
+     * The current updatable result set.
+     */
+    ResultSet result;
+
+    private final WebServer server;
+
+    private final ArrayList<String> commandHistory;
+
+    private Connection conn;
+    private DatabaseMetaData meta;
+    private DbContents contents = new DbContents();
+    private Bnf bnf;
+    private boolean shutdownServerOnDisconnect;
+
+    WebSession(WebServer server) {
+        this.server = server;
+        // This must be stored in the session rather than in the server.
+        // Otherwise, one client could allow
+        // saving history for others (insecure).
+        this.commandHistory = server.getCommandHistoryList();
+    }
+
+    /**
+     * Put an attribute value in the map.
+     *
+     * @param key the key
+     * @param value the new value
+     */
+    void put(String key, Object value) {
+        map.put(key, value);
+    }
+
+    /**
+     * Get the value for the given key.
+     *
+     * @param key the key
+     * @return the value
+     */
+    Object get(String key) {
+        if ("sessions".equals(key)) {
+            return server.getSessions();
+        }
+        return map.get(key);
+    }
+
+    /**
+     * Remove a session attribute from the map.
+     *
+     * @param key the key
+     */
+    void remove(String key) {
+        map.remove(key);
+    }
+
+    /**
+     * Get the BNF object.
+     *
+     * @return the BNF object
+     */
+    Bnf getBnf() {
+        return bnf;
+    }
+
+    /**
+     * Load the SQL grammar BNF.
+     */
+    void loadBnf() {
+        try {
+            Bnf newBnf = Bnf.getInstance(null);
+            DbContextRule columnRule =
+                    new DbContextRule(contents, DbContextRule.COLUMN);
+            DbContextRule newAliasRule =
+                    new DbContextRule(contents, DbContextRule.NEW_TABLE_ALIAS);
+            DbContextRule aliasRule =
+                    new DbContextRule(contents, DbContextRule.TABLE_ALIAS);
+            DbContextRule tableRule =
+                    new DbContextRule(contents, DbContextRule.TABLE);
+            DbContextRule schemaRule =
+                    new DbContextRule(contents, DbContextRule.SCHEMA);
+            DbContextRule columnAliasRule =
+                    new DbContextRule(contents, DbContextRule.COLUMN_ALIAS);
+            DbContextRule procedure =
+                    new DbContextRule(contents, DbContextRule.PROCEDURE);
+            newBnf.updateTopic("procedure", procedure);
+            newBnf.updateTopic("column_name", columnRule);
+            newBnf.updateTopic("new_table_alias", newAliasRule);
+            newBnf.updateTopic("table_alias", aliasRule);
+            newBnf.updateTopic("column_alias", columnAliasRule);
+            newBnf.updateTopic("table_name", tableRule);
+            newBnf.updateTopic("schema_name", schemaRule);
+            newBnf.linkStatements();
+            bnf = newBnf;
+        } catch (Exception e) {
+            // ok we don't have the bnf
+            server.traceError(e);
+        }
+    }
+
+    /**
+     * Get the SQL statement from history.
+     *
+     * @param id the history id
+     * @return the SQL statement
+     */
+    String getCommand(int id) {
+        return commandHistory.get(id);
+    }
+
+    /**
+     * Add a SQL statement to the history.
+     *
+     * @param sql the SQL statement
+     */
+    void addCommand(String sql) {
+        if (sql == null) {
+            return;
+        }
+        sql = sql.trim();
+        if (sql.length() == 0) {
+            return;
+        }
+        if (commandHistory.size() > MAX_HISTORY) {
+            commandHistory.remove(0);
+        }
+        int idx = commandHistory.indexOf(sql);
+        if (idx >= 0) {
+            commandHistory.remove(idx);
+        }
+        commandHistory.add(sql);
+        if (server.isCommandHistoryAllowed()) {
+            server.saveCommandHistoryList(commandHistory);
+        }
+    }
+
+    /**
+     * Get the list of SQL statements in the history.
+     *
+     * @return the commands
+     */
+    ArrayList<String> getCommandHistory() {
+        return commandHistory;
+    }
+
+    /**
+     * Update session meta data information and get the information in a map.
+     *
+     * @return a map containing the session meta data
+     */
+    HashMap<String, Object> getInfo() {
+        HashMap<String, Object> m = New.hashMap();
+        m.putAll(map);
+        m.put("lastAccess", new Timestamp(lastAccess).toString());
+        try {
+            m.put("url", conn == null ?
+                    "${text.admin.notConnected}" : conn.getMetaData().getURL());
+            m.put("user", conn == null ?
+                    "-" : conn.getMetaData().getUserName());
+            m.put("lastQuery", commandHistory.size() == 0 ?
+                    "" : commandHistory.get(0));
+            m.put("executing", executingStatement == null ?
+                    "${text.admin.no}" : "${text.admin.yes}");
+        } catch (SQLException e) {
+            DbException.traceThrowable(e);
+        }
+        return m;
+    }
+
+    void setConnection(Connection conn) throws SQLException {
+        this.conn = conn;
+        if (conn == null) {
+            meta = null;
+        } else {
+            meta = conn.getMetaData();
+        }
+        contents = new DbContents();
+    }
+
+    DatabaseMetaData getMetaData() {
+        return meta;
+    }
+
+    Connection getConnection() {
+        return conn;
+    }
+
+    DbContents getContents() {
+        return contents;
+    }
+
+    /**
+     * Shutdown the server when disconnecting.
+     */
+    void setShutdownServerOnDisconnect() {
+        this.shutdownServerOnDisconnect = true;
+    }
+
+    boolean getShutdownServerOnDisconnect() {
+        return shutdownServerOnDisconnect;
+    }
+
+    /**
+     * Close the connection and stop the statement if one is currently
+     * executing.
+     */
+    void close() {
+        if (executingStatement != null) {
+            try {
+                executingStatement.cancel();
+            } catch (Exception e) {
+                // ignore
+            }
+        }
+        if (conn != null) {
+            try {
+                conn.close();
+            } catch (Exception e) {
+                // ignore
+            }
+        }
+
+    }
+
+}
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