こんにちは、私はプロジェクトに取り組んでいます。
あなたが私の問題を解決するのを手伝ってくれることを願っています..私は5日間苦労しています!!
私に割り当てられたモジュールで、ファイル、タイトル、カテゴリ、アップロードされた詳細を JSP から controller.do にアップロードするrequest必要responceがexecute()ありCommand.java ます。
アップロードフォームの詳細をすべて渡すResourceCommand.java implements Commandと、DAOを呼び出して途中で実行を停止するという名前のクラスに渡ります!!!!
Upload.jspのコードの一部
<form name="myform_up" method="post" action = "Controller">
<input type="hidden" name="form_action" value="resource" />
<input type="hidden" name="action" value="insert" />
<table>
<tr>
<td>Document Title <font color="red">*</font></td></tr>
<tr>
<td><input type="text" name="name" /></td></tr>
<tr>
<td>Category <font color="red">*</font>
<select name="cat">
<option value="Java" selected >Java Material</option>
<option value="Net">.Net Material</option>
<option value="C">C and C# Material</option>
</select></td>
</tr>
<input type="hidden" name="uploadedby" value="<jsp:getProperty name="userBean" property="user" />" />
<tr>
<td>Upload A file:
<input type="file" name="file1"/></td>
</tr>
<tr>
<td><br/><input type="checkbox" name="t_condition" checked />I Had received Copyrights for this Document</td>
</tr>
<TR>
<td ALIGN="CENTER"><br/>
<INPUT class="button blue" TYPE="submit" value="Upload" />
<INPUT class="button red" TYPE="reset" value="Clear" />
</td></TR>
</TABLE>
</FORM>
Controller.javaのコードの一部
public void init(ServletConfig config) throws ServletException{
super.init();
System.out.println("i am in init");
this.commands.put("login", new LoginCommand());
this.commands.put("resource", new ResourceCommand());
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("i am in doget");
processCommand(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("i am in dopost");
processCommand(request, response);
}
private void processCommand(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String formAction = request.getParameter("form_action");
System.out.println("implementing formAction = " + formAction);
Commands command = (Commands) commands.get(formAction);
command.execute(request, response);
}
}
ResourceCommand.javaのコードの一部
public class ResourceCommand extends HttpServlet implements Commands{
private static final long serialVersionUID = 1L;
public void execute(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if ("insert".equalsIgnoreCase(request.getParameter("action"))) {
this.addResource(request, response);
}
}
private void addResource(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException{
ResourceBean ResourceBean = new ResourceBean();
mapToResourceBeans(request, ResourceBean);
String result = null;
try {
result = new ResourceDAO().uploadResource(request, ResourceBean);
} catch (Exception ex) {
System.err.println(" Error in inserting new resource");
}
if ("success".equalsIgnoreCase(result)) {
// if Block CODE
}
else {
//Else block CODE
}
}
private void mapToResourceBeans(HttpServletRequest request,
ResourceBean ResourceBean) {
ResourceBean.setName(request.getParameter("name"));
ResourceBean.setCat(request.getParameter("cat"));
ResourceBean.setUploadedby(request.getParameter("uploadedby"));
}
}
Command.javaのコードの一部
public interface Commands {
public void execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;
}
ResourceDAO.javaのコードの一部
public class ResourceDAO {
static final String SUCCESS = "success";
static final String FAILURE = "failure";
static Logger log = Logger.getLogger("com.a");
public String uploadResource(HttpServletRequest request,
ResourceBean newResource) throws FileNotFoundException {
String result = null;
PreparedStatement stmtInsert = null;
// Create a Database Connection
Connection con = ConnectionDAO.getJDBCConnection();
try {
PreparedStatement pstmt = con
.prepareStatement("INSERT INTO resource(name, cat, uploadedby, file) values(?,?,?,?)");
pstmt.setString(1, newResource.getName());
System.out.println(newResource.getName());
pstmt.setString(2, newResource.getCat());
System.out.println(newResource.getCat());
pstmt.setString(3, newResource.getUploadedby());
System.out.println(newResource.getUploadedby());
String file = request.getParameter("file1");
System.out.println("0");
File f = new File(file);
System.out.println("1");
FileInputStream fis = new FileInputStream(f);
System.out.println("2");
pstmt.setBinaryStream(4, fis, (int) f.length());
System.out.println("3");
int rows = pstmt.executeUpdate();
result = SUCCESS;
if (rows != 1) { result = FAILURE; }
} catch (SQLException ex) {
result = FAILURE;
ConnectionDAO.rollbackJDBCConnection(con);
ex.printStackTrace();
} finally {
ConnectionDAO.commitJDBCConnection(con);
ConnectionDAO.closeStatement(stmtInsert);
ConnectionDAO.closeJDBCConnection(con);
}
return result;
}
}
コンソールディスプレイ..
implementing formAction = resource
Error in inserting new resource
123
Net
null
0
1
i am going back to addResource page
フォーム TAG に配置 enctype="multipart/form-data"すると、これが得られます。
java.lang.NullPointerException
com.kbcss.controller.Controller.processCommand(Controller.java:57)
com.kbcss.controller.Controller.doPost(Controller.java:49)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
私は完全に道に迷っています..助けてください...