質問編集履歴
4
.
test
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test
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@@ -12,7 +12,7 @@
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12
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-
package sample1;
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'package sample1;
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@@ -188,4 +188,4 @@
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}
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}
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}'
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3
ブラウザに表示はできましたが、改行がうまくいきません。
test
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test
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@@ -1,10 +1,16 @@
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1
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-
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1
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```java
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2
2
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3
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-
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3
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+
コード
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4
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+
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5
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```
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4
6
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7
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package sample1;
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@@ -46,10 +52,6 @@
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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@@ -58,9 +60,23 @@
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PrintWriter out = response.getWriter();
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64
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out.println("<html>");
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out.println("<body>");
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@@ -70,7 +86,7 @@
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String url ="jdbc:mysql://localhost/training";
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-
String user = "r
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89
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+
String user = "root";
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90
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91
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String password ="ryota";
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92
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@@ -80,7 +96,7 @@
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97
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Class.forName("com.mysql.jdbc.Driver").newInstance();
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98
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83
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-
conn = DriverManager.getConnection(url,user,password);
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99
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+
conn = DriverManager.getConnection(url, user, password);
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@@ -94,11 +110,25 @@
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while(rs.next()){
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113
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+
````````````ここに言語を入力
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114
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97
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-
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115
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+
int id = rs.getInt("id");
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98
116
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99
117
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String name = rs.getString("name");
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100
118
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101
119
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int age = rs.getInt("age");
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+
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out.println(id + name + age );
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122
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123
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124
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125
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out.println("\n");
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126
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127
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128
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129
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130
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132
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103
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}
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134
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@@ -140,19 +170,13 @@
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140
170
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141
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}
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142
172
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173
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+
//out.println("</html>");
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143
174
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175
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+
out.println("</body>");
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144
176
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145
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-
out.println("<html>");
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177
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+
out.println("</html>");
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146
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-
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147
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-
out.println("<body>");
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148
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-
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149
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-
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150
178
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151
179
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}
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152
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-
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153
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-
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154
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-
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155
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-
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156
180
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181
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182
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@@ -165,5 +189,3 @@
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165
189
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}
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166
190
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167
191
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}
|
168
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-
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169
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-
```
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2
マークダウン<code>
test
CHANGED
File without changes
|
test
CHANGED
@@ -3,6 +3,8 @@
|
|
3
3
|
クラスを定義して書くのでしょうか?
|
4
4
|
|
5
5
|
|
6
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+
|
7
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+
```java
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6
8
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|
7
9
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package sample1;
|
8
10
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@@ -163,3 +165,5 @@
|
|
163
165
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}
|
164
166
|
|
165
167
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}
|
168
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+
|
169
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+
```
|
1
コードを書いてみましたが SQLException:Access denied for user 'ryota'@'localhost' (using password: YES) とエラーがでます
test
CHANGED
File without changes
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test
CHANGED
@@ -1,3 +1,165 @@
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|
1
1
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サーブレットからmysql に接続する場合、どこに接続の記述をするのでしょうか?
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2
2
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|
3
3
|
クラスを定義して書くのでしょうか?
|
4
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+
|
5
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+
|
6
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+
|
7
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+
package sample1;
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8
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+
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9
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+
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10
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+
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11
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+
import java.io.IOException;
|
12
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+
|
13
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+
import java.io.PrintWriter;
|
14
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+
|
15
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+
import java.sql.Connection;
|
16
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+
|
17
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+
import java.sql.DriverManager;
|
18
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+
|
19
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+
import java.sql.ResultSet;
|
20
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+
|
21
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+
import java.sql.SQLException;
|
22
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+
|
23
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+
import java.sql.Statement;
|
24
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+
|
25
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+
|
26
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+
|
27
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+
import javax.servlet.ServletException;
|
28
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+
|
29
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+
import javax.servlet.annotation.WebServlet;
|
30
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+
|
31
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+
import javax.servlet.http.HttpServlet;
|
32
|
+
|
33
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+
import javax.servlet.http.HttpServletRequest;
|
34
|
+
|
35
|
+
import javax.servlet.http.HttpServletResponse;
|
36
|
+
|
37
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+
|
38
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+
|
39
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+
@WebServlet("/Hello")
|
40
|
+
|
41
|
+
public class Hello extends HttpServlet {
|
42
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+
|
43
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+
private static final long serialVersionUID = 1L;
|
44
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+
|
45
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+
|
46
|
+
|
47
|
+
|
48
|
+
|
49
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+
|
50
|
+
|
51
|
+
protected void doGet(HttpServletRequest request, HttpServletResponse response)
|
52
|
+
|
53
|
+
throws ServletException, IOException {
|
54
|
+
|
55
|
+
response.setContentType("text/html; charset=utf-8");
|
56
|
+
|
57
|
+
PrintWriter out = response.getWriter();
|
58
|
+
|
59
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+
out.println("<html>");
|
60
|
+
|
61
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+
out.println("<body>");
|
62
|
+
|
63
|
+
|
64
|
+
|
65
|
+
|
66
|
+
|
67
|
+
Connection conn = null;
|
68
|
+
|
69
|
+
String url ="jdbc:mysql://localhost/training";
|
70
|
+
|
71
|
+
String user = "ryota";
|
72
|
+
|
73
|
+
String password ="ryota";
|
74
|
+
|
75
|
+
|
76
|
+
|
77
|
+
try{
|
78
|
+
|
79
|
+
Class.forName("com.mysql.jdbc.Driver").newInstance();
|
80
|
+
|
81
|
+
conn = DriverManager.getConnection(url,user,password);
|
82
|
+
|
83
|
+
|
84
|
+
|
85
|
+
Statement stmt =conn.createStatement();
|
86
|
+
|
87
|
+
String sql ="SELECT * FROM user";
|
88
|
+
|
89
|
+
ResultSet rs = stmt.executeQuery(sql);
|
90
|
+
|
91
|
+
|
92
|
+
|
93
|
+
while(rs.next()){
|
94
|
+
|
95
|
+
int id = rs.getInt("id");
|
96
|
+
|
97
|
+
String name = rs.getString("name");
|
98
|
+
|
99
|
+
int age = rs.getInt("age");
|
100
|
+
|
101
|
+
}
|
102
|
+
|
103
|
+
|
104
|
+
|
105
|
+
rs.close();
|
106
|
+
|
107
|
+
stmt.close();
|
108
|
+
|
109
|
+
}catch(ClassNotFoundException e){
|
110
|
+
|
111
|
+
out.println("lassNotFoundException:"+ e.getMessage());
|
112
|
+
|
113
|
+
}catch(SQLException e){
|
114
|
+
|
115
|
+
out.println("SQLException:" + e.getMessage());
|
116
|
+
|
117
|
+
}catch(Exception e){
|
118
|
+
|
119
|
+
out.println("Exception:" + e.getMessage()); }
|
120
|
+
|
121
|
+
finally{
|
122
|
+
|
123
|
+
|
124
|
+
|
125
|
+
try{
|
126
|
+
|
127
|
+
if(conn !=null){
|
128
|
+
|
129
|
+
conn.close();}
|
130
|
+
|
131
|
+
}catch (SQLException e){
|
132
|
+
|
133
|
+
out.println("SQLException:" + e.getMessage());
|
134
|
+
|
135
|
+
}
|
136
|
+
|
137
|
+
|
138
|
+
|
139
|
+
}
|
140
|
+
|
141
|
+
|
142
|
+
|
143
|
+
out.println("<html>");
|
144
|
+
|
145
|
+
out.println("<body>");
|
146
|
+
|
147
|
+
|
148
|
+
|
149
|
+
}
|
150
|
+
|
151
|
+
|
152
|
+
|
153
|
+
|
154
|
+
|
155
|
+
|
156
|
+
|
157
|
+
protected void doPost(HttpServletRequest request, HttpServletResponse response)
|
158
|
+
|
159
|
+
throws ServletException, IOException {
|
160
|
+
|
161
|
+
doGet(request, response);
|
162
|
+
|
163
|
+
}
|
164
|
+
|
165
|
+
}
|