Question

这段代码非常适合我。我创建了一个html表单，用户输入的所有输入都将转换为java中的字符串。我会使用这些字符串和准备好的语句将信息输入SQLite。

我让它工作，测试了几次，它是完美的。然后我将代码最小化了几个小时。我再打开它，它就停止了工作。现在所有的字符串都是“null”。不知道为什么。

这是employeeDAO准备好的声明：

 static boolean insertEmployeeAtId(String name, String gender, String dob, String address, String postcode, String natins, String title, String startdate, String salary, String email) throws SQLException {
    Employees e = new Employees();
    PreparedStatement s;

    s = connect.prepareStatement(
            "INSERT INTO Emp_db (Name, Gender, DOB, Address, Postcode, NIN, JobTitle, StartDate, Salary, Email) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");


    s.setString(1, name);
    s.setString(2, String.valueOf(gender));
    s.setString(3, dob);
    s.setString(4, address);
    s.setString(5, postcode);
    s.setString(6, natins);
    s.setString(7, title);
    s.setString(8, startdate);
    s.setString(9, salary);
    s.setString(10, email);
    return s.execute();
    }
}

html表单的片段：

 <form id="empForm" method="POST" action="/processEmp">
<h1 class="card-title">Add Employees</h1>
<div class="form-group">
    <label for="name">Name:</label>
    <input id="name" class="form-control" type="text" name=\"name\" pattern="[a-zA-Z-'\s]+" required/>
</div>

以下是涉及信息处理的控制器：

 server.createContext("/processEmp", new HttpHandler() {
        @Override
        public void handle(HttpExchange t) throws IOException {
            boolean insertEmployee;
            try {
                HashMap<String, String> post = new HashMap<String, String>();

                BufferedReader in = new BufferedReader(new InputStreamReader(t.getRequestBody()));
                String line = "";
                String request = "";
                while ((line = in.readLine()) != null) {
                    request = request + line;
                }
                String[] pairs = request.split(
                        "&"
                );
                for
                        (
                        int
                        i = 0; i < pairs.
                        length
                        ; i++) {
                    String pair = pairs[i];
                    post.put(URLDecoder.decode(pair.split("=")[0], "UTF-8")
                            , URLDecoder.decode(pair.split("=")[1], "UTF-8"));
                }

                String EmpName = post.get("name");
                String EmpGender = post.get("gender");
                String EmpDob = post.get("dob");
                String EmpAddress = post.get("address");
                String EmpPostcode = post.get("postcode");
                String EmpNatins = post.get("natInscNo");
                String EmpTitle = post.get("title");
                String EmpStartDate = post.get("startDate");
                String EmpSalary = post.get("salary");
                String EmpEmail = post.get("email");

                String allEmp = "Name: " + EmpName + " Gender: " + EmpGender + " Dob: " + EmpDob + " Address: " + EmpAddress + " Postcode: " + EmpPostcode + " NatInscNo: " + EmpNatins + " Title: " + EmpTitle + " StartDate: " + EmpStartDate + " Salary: " + EmpSalary + " Email: " + EmpEmail;
                dao.insertEmployeeAtId(EmpName, EmpGender, EmpDob, EmpAddress, EmpPostcode, EmpNatins, EmpTitle, EmpStartDate, EmpSalary, EmpEmail);
                BufferedWriter out = new BufferedWriter(new
                        OutputStreamWriter(t.getResponseBody()));
                out.write("Result = ");
                out.write(String.valueOf(allEmp));
                t.sendResponseHeaders(200, 0);
                out.close();
            }catch(SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });

    server.setExecutor(null); // default implementation of threading
    server.start();
    System.out.println("The server is up and running on port 8005");
}

我宁愿知道它为什么要工作以及如何修复它然后使用另一种方法将html中的输入值转换为java中的字符串。任何形式的帮助将不胜感激。

这段代码昨天工作得很好 - 现在却没有

0 个答案: