質問編集履歴
4
エラー文を追加
test
CHANGED
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File without changes
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test
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@@ -245,3 +245,41 @@
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245
245
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246
246
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247
247
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```
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248
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+
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249
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+
エラー
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250
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+
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251
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```ここに言語を入力
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252
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+
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253
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+
HTTPステータス 500 -
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254
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+
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255
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type 例外レポート
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256
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+
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257
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+
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258
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+
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259
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+
メッセージ
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260
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+
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261
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+
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262
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263
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+
説明 The server encountered an internal error that prevented it from fulfilling this request.
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264
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265
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+
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266
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267
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+
例外
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268
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269
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270
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271
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+
java.lang.NullPointerException
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272
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+
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273
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+
controller.Controller.doPost(Controller.java:43)
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274
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+
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275
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+
controller.Controller.doGet(Controller.java:26)
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276
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+
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277
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+
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
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278
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+
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279
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+
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
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280
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+
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281
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+
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
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282
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+
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283
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+
```
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284
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+
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285
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+
43行目はswitchのbuttonIdです。
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3
actionクラスの追加
test
CHANGED
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File without changes
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test
CHANGED
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@@ -191,3 +191,57 @@
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191
191
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}
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192
192
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193
193
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```
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194
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+
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195
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+
```Action
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196
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+
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197
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+
public class GoMainAction {
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198
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+
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199
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+
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200
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+
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201
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+
public String execute(HttpServletRequest req) {
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202
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+
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203
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+
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204
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+
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205
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+
//遷移先
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206
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+
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207
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+
String page = "/WEB-INF/jsp/main.jsp";
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208
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+
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209
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+
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210
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+
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211
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+
//セッション取得
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212
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+
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213
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+
HttpSession session = req.getSession(false);
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214
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+
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215
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+
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216
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+
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217
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//ログインチェック。セッションなければnullなのでエラー返す
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218
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+
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219
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+
if(session==null){
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220
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+
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221
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+
page = "/dokotsubu/top.jsp";
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222
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+
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223
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+
}
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224
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+
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225
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+
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226
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+
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227
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+
//セッションから過去のツイートを取り出し
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228
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+
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229
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+
ArrayList<String> tweetList = (ArrayList<String>)session.getAttribute("tweet");
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230
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+
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231
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+
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232
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+
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233
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+
//過去のツイートある場合
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234
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+
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235
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+
session.setAttribute("tweetList", tweetList);
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236
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+
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237
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+
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238
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+
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239
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+
return page;
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240
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+
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241
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+
}
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242
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+
|
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243
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+
}
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244
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+
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245
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+
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246
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247
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```
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2
サーブレットを追加
test
CHANGED
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File without changes
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test
CHANGED
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@@ -6,19 +6,19 @@
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6
6
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7
7
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隠しパラメータを使用してボタンと同じように実装してみた以下のコードでは
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8
8
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9
|
-
buttonIdがnullになっているようで、
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9
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+
buttonIdがnullになっているようで、リンクをクリックすると
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10
10
|
|
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11
11
|
500エラーでNullPointerExceptionが出ます。
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12
12
|
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13
13
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|
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14
14
|
|
|
15
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-
どうすればサーブレットを呼び出すことができるか教えていただきたいです。
|
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15
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+
どうすればサーブレットを正しく呼び出すことができるか教えていただきたいです。
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16
16
|
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17
17
|
よろしくお願いします。
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18
18
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19
19
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20
20
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21
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-
```
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21
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+
```JSP
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22
22
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23
23
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<%@ page language="java" contentType="text/html; charset=UTF-8"
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24
24
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@@ -64,13 +64,11 @@
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64
64
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65
65
|
<br>
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66
66
|
|
|
67
|
-
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|
67
|
+
<%--この部分 --%>
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68
68
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69
69
|
<input type="hidden" value="" name="buttonId">
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70
70
|
|
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71
71
|
<a href onclick="javascript:this.form.buttonId.value='UC0004'; this.form.submit();">つぶやきの投稿・閲覧へ</a>
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|
72
|
-
|
|
73
|
-
//＊この部分＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
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74
72
|
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|
75
73
|
</c:if>
|
|
76
74
|
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|
@@ -81,3 +79,115 @@
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|
|
81
79
|
</html>
|
|
82
80
|
|
|
83
81
|
```
|
|
82
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+
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|
83
|
+
```Servlet
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|
84
|
+
|
|
85
|
+
@WebServlet("/doko")
|
|
86
|
+
|
|
87
|
+
public class Controller extends HttpServlet {
|
|
88
|
+
|
|
89
|
+
private static final long serialVersionUID = 1L;
|
|
90
|
+
|
|
91
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+
|
|
92
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+
|
|
93
|
+
protected void doGet(HttpServletRequest request, HttpServletResponse response)
|
|
94
|
+
|
|
95
|
+
throws ServletException, IOException {
|
|
96
|
+
|
|
97
|
+
doPost(request, response);
|
|
98
|
+
|
|
99
|
+
}
|
|
100
|
+
|
|
101
|
+
|
|
102
|
+
|
|
103
|
+
/**
|
|
104
|
+
|
|
105
|
+
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
|
|
106
|
+
|
|
107
|
+
*/
|
|
108
|
+
|
|
109
|
+
protected void doPost(HttpServletRequest request, HttpServletResponse response)
|
|
110
|
+
|
|
111
|
+
throws ServletException, IOException {
|
|
112
|
+
|
|
113
|
+
|
|
114
|
+
|
|
115
|
+
//受け取った値の文字コード設定
|
|
116
|
+
|
|
117
|
+
request.setCharacterEncoding("UTF-8");
|
|
118
|
+
|
|
119
|
+
|
|
120
|
+
|
|
121
|
+
String page = null;
|
|
122
|
+
|
|
123
|
+
|
|
124
|
+
|
|
125
|
+
String buttonId = request.getParameter("buttonId");
|
|
126
|
+
|
|
127
|
+
|
|
128
|
+
|
|
129
|
+
//ボタンIDで遷移先の振り分け
|
|
130
|
+
|
|
131
|
+
switch (buttonId) {
|
|
132
|
+
|
|
133
|
+
|
|
134
|
+
|
|
135
|
+
case "UC0001":
|
|
136
|
+
|
|
137
|
+
LoginAction loginAction = new LoginAction();
|
|
138
|
+
|
|
139
|
+
page = loginAction.execute(request);
|
|
140
|
+
|
|
141
|
+
break;
|
|
142
|
+
|
|
143
|
+
|
|
144
|
+
|
|
145
|
+
case "UC0002":
|
|
146
|
+
|
|
147
|
+
TweetAction tweetAction = new TweetAction();
|
|
148
|
+
|
|
149
|
+
page = tweetAction.execute(request);
|
|
150
|
+
|
|
151
|
+
break;
|
|
152
|
+
|
|
153
|
+
|
|
154
|
+
|
|
155
|
+
case "UC0003":
|
|
156
|
+
|
|
157
|
+
LogoutAction logoutAction = new LogoutAction();
|
|
158
|
+
|
|
159
|
+
page = logoutAction.execute(request);
|
|
160
|
+
|
|
161
|
+
break;
|
|
162
|
+
|
|
163
|
+
|
|
164
|
+
|
|
165
|
+
case "UC0004":
|
|
166
|
+
|
|
167
|
+
GoMainAction goMainAction = new GoMainAction();
|
|
168
|
+
|
|
169
|
+
page = goMainAction.execute(request);
|
|
170
|
+
|
|
171
|
+
break;
|
|
172
|
+
|
|
173
|
+
|
|
174
|
+
|
|
175
|
+
}
|
|
176
|
+
|
|
177
|
+
|
|
178
|
+
|
|
179
|
+
//フォワード
|
|
180
|
+
|
|
181
|
+
RequestDispatcher dispacher = request.getRequestDispatcher(page);
|
|
182
|
+
|
|
183
|
+
dispacher.forward(request, response);
|
|
184
|
+
|
|
185
|
+
|
|
186
|
+
|
|
187
|
+
}
|
|
188
|
+
|
|
189
|
+
|
|
190
|
+
|
|
191
|
+
}
|
|
192
|
+
|
|
193
|
+
```
|
1
コードをわかりやすく
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -64,11 +64,13 @@
|
|
|
64
64
|
|
|
65
65
|
<br>
|
|
66
66
|
|
|
67
|
-
//この部分
|
|
67
|
+
//＊この部分＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
|
|
68
68
|
|
|
69
69
|
<input type="hidden" value="" name="buttonId">
|
|
70
70
|
|
|
71
71
|
<a href onclick="javascript:this.form.buttonId.value='UC0004'; this.form.submit();">つぶやきの投稿・閲覧へ</a>
|
|
72
|
+
|
|
73
|
+
//＊この部分＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
|
|
72
74
|
|
|
73
75
|
</c:if>
|
|
74
76
|
|