Question

我正在尝试从我的jsp更改网页上的文本区域中的文本，然后我可以获取已更改的文本，然后使用API将其推送到网站。但每次我尝试在我的doPost方法中使用.getParameter（“textArea”）调用来从文本区域获取更改的文本时，当我尝试在控制台中将其打印出来时，它只会打印出null。我有一个GET方法，从网站获取我想要的信息，然后将信息的值放在文本区域。我也测试了我的帖子方法，它会发布到网站上。

这是我的Controller.java类，它有我的doGet和doPost方法：

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import com.gurock.testrail.APIClient;
import com.gurock.testrail.APIException;
import java.util.Map;
import java.util.HashMap;
import org.json.simple.JSONObject;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet("/Controller")
public class Controller extends HttpServlet {
private static final long serialVersionUID = 1L;
public static String local;   //String used to set attribute
//constructor
public Controller() {
    super();
}

// *** doGet method ***

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    String input = "";
    try (PrintWriter out = response.getWriter()) { 
    if(request.getParameter("submitGet") != null) {
    input = request.getParameter("input");
    APIClient client = new APIClient("...");    
    client.setUser("...");          //set user name for login
    client.setPassword("...");             //set password for login
    try {
    JSONObject  c = (JSONObject) client.sendGet("get_case/" + input);    //send a get request to the web page and get case ID
    local = c.get("custom_test_script").toString();                      //get the custom test script from web page
    request.setAttribute("Local", local); //set the attribute of the test script with String local     
  }//try 
    catch (APIException e) {    //Pulls from APIException java class
    e.printStackTrace();
 }//catch
}//if

    //next two lines allows information that was output to stay on the same web page and not redirect too another page and allow more input
    RequestDispatcher requestDispatcher = request.getRequestDispatcher("/testCases.jsp");
    requestDispatcher.forward(request, response);                                           
}//try
}//doGet


// *** doPost Method ***

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {  //get input from web page 
    if(request.getParameter("submitPost") != null) {
    String test_id=request.getParameter("test_id");
    String textarea = request.getParameter("textArea");
    APIClient client = new APIClient("...");    
    client.setUser("...");          //set user name for login
    client.setPassword("...");            // set password for login
    try { 
    Map data = new HashMap();
    System.out.println(textarea);
    data.put("custom_test_script", textarea);
    client.sendPost("update_case/" + test_id, data);
    }//try
   catch (APIException e) {
   e.printStackTrace();
}//catch
 }//if
    RequestDispatcher requestDispatcher = request.getRequestDispatcher("/testCases.jsp");
    requestDispatcher.forward(request, response); 
}//try
}//doPost
}//Controller

这是我的.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link rel="stylesheet" type="text/css" href="testCases.css">
<title>Test Cases</title>
</head>
<body>
<center><h1>Test Cases</h1></center>
<form action="Controller" method="get" id="getForm">

    <label>Input Test Case ID #: </label>
    <input type="text" name="input" value="">

    <input type="submit" value="Submit" name="submitGet" class="btn btn-
 primary"> <br><br><br><br>
    <label>Test Case Test Script: </label>
    <textarea name="textArea" id="output"> 
 <%=request.getAttribute("Local")%></textarea>
 </form>

 <form action="Controller" method="post" id="postForm">

 <label>Enter Test ID: </label>
 <input type="text" name="test_id" value="">

 <input type="submit" value="Submit" name="submitPost" class="btn btn-
primary">

 </form>
</body>
</html>

我认为我的doPost方法或getParameter（）调用的问题是在文本区域中包含文本之前尝试获取文本区域的参数。我也尝试了getAttribute（“textArea”），它也没有用。任何帮助表示赞赏！

Answer 1

已解决：我所要做的就是将我的文本区域从我的get方法移动到jsp中的post方法，并且它有效。

<center><h1>Test Cases</h1></center>
<form action="Controller" method="get" id="getForm">

    <label>Input Test Case ID #: </label>
    <input type="text" name="input" value="">

    <input type="submit" value="Submit" name="submitGet" class="btn btn-
primary"> <br><br><br><br>
</form>

<form action="Controller" method="post" id="postForm">
<label>Test Case Test Script: </label>
    <textarea name="textArea" id="output"> 
<%=request.getAttribute("Local")%></textarea>

<label>Enter Test ID: </label>
 <input type="text" name="test_id" value="">

<input type="submit" value="Submit" name="submitPost" class="btn btn-
 primary">

</form>
</body>
</html>

尝试从jsp中的文本区域中提取文本，返回null

1 个答案: