[ch04] chapter 4.8, context init parameter

Signed-off-by: Dongho Sim <dhsim86@gmail.com>
dhsim86 · Mar 7, 2017 · 721b501 · 721b501
1 parent 36afd54
commit 721b501
Show file tree

Hide file tree

Showing 4 changed files with 43 additions and 21 deletions.
diff --git a/src/main/java/Lesson04/MemberAddServlet.java b/src/main/java/Lesson04/MemberAddServlet.java
@@ -1,5 +1,6 @@
 package Lesson04;
 
+import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
@@ -45,15 +46,15 @@ protected void doPost(HttpServletRequest request, HttpServletResponse response)
         PreparedStatement stmt = null;
 
         try {
+            ServletContext sc = this.getServletContext();
 
             request.setCharacterEncoding("UTF-8");
-
-            DriverManager.registerDriver(new com.mysql.jdbc.Driver());
 
+            Class.forName(sc.getInitParameter("driver"));
             conn = DriverManager.getConnection(
-                    "jdbc:mysql://localhost/studydb?useUnicode=true&characterEncoding=UTF-8",
-                    "study",
-                    "study"
+                sc.getInitParameter("url"),
+                sc.getInitParameter("username"),
+                sc.getInitParameter("password")
             );
 
             stmt = conn.prepareStatement(

diff --git a/src/main/java/Lesson04/MemberListServlet.java b/src/main/java/Lesson04/MemberListServlet.java
@@ -1,9 +1,6 @@
 package Lesson04;
 
-import javax.servlet.GenericServlet;
-import javax.servlet.ServletException;
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
+import javax.servlet.*;
 import javax.servlet.annotation.WebServlet;
 import java.io.IOException;
 import java.io.PrintWriter;
@@ -28,12 +25,14 @@ public void service(ServletRequest request, ServletResponse response)
 
         try {
 
-            DriverManager.registerDriver(new com.mysql.jdbc.Driver());
+            ServletContext sc = this.getServletContext();
+
+            Class.forName(sc.getInitParameter("driver"));
 
             conn = DriverManager.getConnection(
-                    "jdbc:mysql://localhost/studydb?useUnicode=true&characterEncoding=UTF-8",
-                    "study",
-                    "study"
+                sc.getInitParameter("url"),
+                sc.getInitParameter("username"),
+                sc.getInitParameter("password")
             );
             stmt = conn.createStatement();
             rs = stmt.executeQuery(

diff --git a/src/main/java/Lesson04/MemberUpdateServlet.java b/src/main/java/Lesson04/MemberUpdateServlet.java
@@ -1,5 +1,6 @@
 package Lesson04;
 
+import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
@@ -24,11 +25,13 @@ public void doGet(
         ResultSet rs = null;
 
         try {
-            Class.forName(this.getInitParameter("driver"));
+            ServletContext sc = this.getServletContext();
+
+            Class.forName(sc.getInitParameter("driver"));
             conn = DriverManager.getConnection(
-                this.getInitParameter("url"),
-                this.getInitParameter("username"),
-                this.getInitParameter("password")
+                sc.getInitParameter("url"),
+                sc.getInitParameter("username"),
+                sc.getInitParameter("password")
             );
             stmt = conn.createStatement();
             rs = stmt.executeQuery(
@@ -79,11 +82,13 @@ protected void doPost(
         PreparedStatement stmt = null;
 
         try {
-            Class.forName(this.getInitParameter("driver"));
+            ServletContext sc = this.getServletContext();
+
+            Class.forName(sc.getInitParameter("driver"));
             conn = DriverManager.getConnection(
-                this.getInitParameter("url"),
-                this.getInitParameter("username"),
-                this.getInitParameter("password")
+                sc.getInitParameter("url"),
+                sc.getInitParameter("username"),
+                sc.getInitParameter("password")
             );
             stmt = conn.prepareStatement(
                 "update members set email = ?, mname = ?, mod_date = now()" +

diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml
@@ -6,6 +6,23 @@
   id="WebApp_ID"
   version="3.0">
 
+    <context-param>
+        <param-name>driver</param-name>
+        <param-value>com.mysql.jdbc.Driver</param-value>
+    </context-param>
+    <context-param>
+        <param-name>url</param-name>
+        <param-value>jdbc:mysql://localhost/studydb?useUnicode=true&amp;characterEncoding=UTF-8</param-value>
+    </context-param>
+    <context-param>
+        <param-name>username</param-name>
+        <param-value>study</param-value>
+    </context-param>
+    <context-param>
+        <param-name>password</param-name>
+        <param-value>study</param-value>
+    </context-param>
+
     <!-- servlets -->
     <servlet>
       <servlet-name>Hello</servlet-name>