afficher un tableau JSON dans une table html (une page jsp)

Question

Comme le titre l'indique, comment générer correctement un tableau JSON dans une table à partir d'une page JSP?

En ce moment, chaque fois que j'afficher l'objet de tableau JSON en utilisant <c:out value="${jsonArray}"/> mais il ne fait qu'afficher tout le contenu de celui-ci dans la chaîne JSON-à-dire {name: hello, address: baker street } mais ce que je veux faire est parser en quelque sorte cela et afficher les informations de manière appropriée comme ceci:

**name**  **address** 
hello  baker street 
spring java 
tim  sun 

Est-ce possible en JSTL? Je suis nouveau aux choses de JSTL.

package com.kc.models; 

import java.io.ByteArrayOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.sql.Blob; 
import java.sql.SQLException; 

import org.hibernate.Hibernate; 

public class FileObject { 

    private String filename; 
    private String type; 
    private double size; 
    private Blob file; 
    private int id; 
    private String os; 
    private String description; 

    public FileObject() { 

    } 

    /** 
    * Constructor for use in returning just the list of files without the 
    * actual content 
    * 
    * @param name 
    * @param size 
    * @param id 
    * @param type 
    */ 
    public FileObject(String name, double size, int id, String type) { 
     this.filename = name; 
     this.type = type; 
     this.size = size; 
     this.id = id; 

    } 

    /** 
    * Constructor used to create a fileObject with all its properties assigned 
    * 
    * @param name 
    * @param size 
    * @param id 
    * @param type 
    * @param file 
    */ 
    public FileObject(String name, double size, int id, String type, Blob file, 
      String os, String description) { 
     this.filename = name; 
     this.type = type; 
     this.size = size; 
     this.id = id; 
     this.file = file; 
     this.os = os; 
     this.description = description; 

    } 

    public FileObject(String description){ 
     this.description = description; 
    } 

    public int getId() { 
     return id; 
    } 

    public void setId(int id) { 
     this.id = id; 
    } 

    public String getFilename() { 
     return filename; 
    } 

    public void setFilename(String fileName) { 
     this.filename = fileName; 
    } 

    public String getType() { 
     return type; 
    } 

    public void setType(String type) { 
     this.type = type; 
    } 

    public double getSize() { 
     return size; 
    } 

    public void setSize(double size) { 
     this.size = size; 
    } 

    public Blob getFile() { 
     return file; 
    } 

    public void setFile(Blob file) { 
     this.file = file; 
    } 

    public String getOs() { 
     return os; 
    } 

    public void setOs(String os) { 
     this.os = os; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description; 
    } 


} 



@Override 
    public ModelAndView handleRequest(HttpServletRequest request, 
      HttpServletResponse response) throws Exception { 
     // TODO call a method that returns a list of Mobile Apps. 


     String fileType = ServletRequestUtils.getRequiredStringParameter(request, "fileType"); 


     //testAddingSomeFilesToDb(); 
     return new ModelAndView("" + "testJsonResponse", "jsonArray", 
       getFileList(fileType)); 

    } 

/** 
* Get file list from sql server based on type 
* @return file list in json 
*/ 
private JSONArray getFileList(String type) { 
    // TODO: Get request parameter that states what type of file extensions 
    // the client wants to recieve 

    ctx = new ClassPathXmlApplicationContext("zang-file-service.xml"); 
    FileHelper file = (FileHelper) ctx.getBean("fileHelper"); 

    return file.getFileList(type); 
} 




public JSONArray getFileList(String type) { 

     return constructJsonArray(dbFileHelper.getFileList(type)); 
    } 

    private JSONArray constructJsonArray(List<FileObject> fileList) { 

     JSONArray mJsonArray = new JSONArray(); 
     JSONObject mJsonFileObject = new JSONObject(); 

     for (int i = 0; i < fileList.size(); i++) { 
      mJsonFileObject.put("FileObject", fileList.get(i)); 
      System.out.println("File ID = " + fileList.get(i).getId()); 
      System.out.println("fileName = " + fileList.get(i).getFilename()); 
      System.out.println("type = " + fileList.get(i).getType()); 
      System.out.println("size = " + fileList.get(i).getSize()); 
      mJsonArray.add(mJsonFileObject); 

     } 

     return mJsonArray; 
    } 

ici est ma page jsp:

<%@ include file="/WEB-INF/jsp/include.jsp" %> 
<!DOCTYPE html> 
<html lang="en"> 
    <head> 
     <title>Test</title> 
     <script src="http://code.jquery.com/jquery-latest.min.js"></script> 
     <script> 
      var files = "${jsonArray}"; 
      $(document).ready(function() { 
       var table = $('<table/>').appendTo($('#somediv')); 
       $(files).each(function(i, file) { 
        $('<tr/>').appendTo(table) 
         .append($('<td/>').text(file.filename)) 
         .append($('<td/>').text(file.id)) 
         .append($('<td/>').text(file.type)) 
         .append($('<td/>').text(file.size)) 
         .append($('<td/>').text(file.os)); 
       }); 
      }); 
     </script> 
    </head> 
    <body> 
     <div id="somediv"></div> 
    </body> 
</html> 

edit: voici mon JSON:

var files = [{"FileObject":{"description":"","file":null,"filename":"ACG Simulator(firefox).jpg","id":6,"os":"","size":172,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"car.jpg","id":11,"os":"","size":152,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"contacts highlighted.jpg","id":13,"os":"","size":47,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"contacts highlighted2.jpg","id":14,"os":"","size":49,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"contacts options.jpg","id":15,"os":"","size":49,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"edit contact view.jpg","id":17,"os":"","size":52,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"fileObject.jpg","id":20,"os":"","size":30,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"groups.jpg","id":27,"os":"","size":31,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"inside contacts.jpg","id":31,"os":"","size":49,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"Music highlighted.jpg","id":37,"os":"","size":47,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"music options view.jpg","id":38,"os":"","size":46,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"music phone view.jpg","id":39,"os":"","size":51,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"music vault view.jpg","id":40,"os":"","size":48,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"nice.jpg","id":41,"os":"","size":225,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"photo highlighted.jpg","id":42,"os":"","size":47,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"photo options view.jpg","id":43,"os":"","size":48,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"photo preview view.jpg","id":44,"os":"","size":46,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"photos phone view.jpg","id":45,"os":"","size":51,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"photos vault view.jpg","id":46,"os":"","size":49,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"svn error.jpg","id":54,"os":"","size":35,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"Video Highlighted.jpg","id":55,"os":"","size":47,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"Videos options view.jpg","id":56,"os":"","size":47,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"videos phone view.jpg","id":57,"os":"","size":50,"type":"jpg"}},{"FileObject":{"description":"","file":null,"filename":"videos Vault view.jpg","id":58,"os":"","size":49,"type":"jpg"}}] 

Answer 1

En supposant:

jsonArray = [ {name: 'hello', address: 'baker street'}, ... ]; 

Une façon de le faire est pour construire le code HTML en code Javascript comme celui-ci :

var myHTMLStr = '<table>'; 
for(var i in jsonArray) { 
myHTMLStr+='<tr><td>' + jsonArray[i]['name'] + '</td><td>' + jsonArray[i]['address'] + '</td></tr>'; 

} 
myHTMLStr+='</table>'; 

maintenant afficher la chaîne HTML:

document.getElementById('tableOutput').innerHTML = myHTMLStr; 

Answer 2

Votre question est trop ambiguë pour donner une réponse appropriée, donc je vais couvrir tous les scénarios possibles:

1. Vous avez comme une variable JavaScript comme ça:

   var persons = [ 
       { "name": "John Doe", "address": "Main Street 1" }, 
       { "name": "Jane Doe", "address": "Baker Street 1" }, 
       { "name": "Jack Doe", "address": "Church Street 1" } 
   ]; 
   

   Je suggère d'utiliser jQuery pour créer une table HTML à partir de celui-ci. Voici un SSCCE, vous pouvez copy'n'paste'n'run il:

   <!DOCTYPE html> 
   <html lang="en"> 
       <head> 
        <title>Test</title> 
        <script src="http://code.jquery.com/jquery-latest.min.js"></script> 
        <script> 
         var persons = [ 
          { "name": "John Doe", "address": "Main Street 1" }, 
          { "name": "Jane Doe", "address": "Baker Street 1" }, 
          { "name": "Jack Doe", "address": "Church Street 1" } 
         ]; 
         $(document).ready(function() { 
          var table = $('<table/>').appendTo($('#somediv')); 
          $(persons).each(function(i, person) { 
           $('<tr/>').appendTo(table) 
            .append($('<td/>').text(person.name)) 
            .append($('<td/>').text(person.address)); 
          }); 
         }); 
        </script> 
       </head> 
       <body> 
        <div id="somediv"></div> 
       </body> 
   </html> 
   

2. Vous l'avez comme une variable String Java comme ceci:

   String jsonPersons = "[" 
        + "{ \"name\": \"John Doe\", \"address\": \"Main Street 1\" }," 
        + "{ \"name\": \"Jane Doe\", \"address\": \"Baker Street 1\" }," 
        + "{ \"name\": \"Jack Doe\", \"address\": \"Church Street 1\" }" 
       + "]"; 
   

   alors je suggère d'utiliser un JSON analyseur pour obtenir un List<Person> hors de lui, comme Google Gson:

   List<Person> persons = new Gson().fromJson(jsonPersons, new TypeToken<List<Person>>() {}.getType()); 
   

   Lorsque le look classe Person comme ceci:

   public class Person { 
       private String name; 
       private String address; 
       // Add or generate getters/setters. 
   } 
   

   Laissez le servlet mettre dans le périmètre de la requête et de transmettre à JSP pour l'affichage comme ceci:

   request.setAttribute("persons", persons); 
   request.getRequestDispatcher("/WEB-INF/persons.jsp").forward(request, response); 
   

   Dans JSP, utilisez JSTL <c:forEach> pour itérer dessus:

   <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
   ... 
   <table> 
       <c:forEach items="${persons}" var="person"> 
        <tr> 
         <td>${person.name}</td> 
         <td>${person.address}</td> 
        </tr> 
       </c:forEach> 
   </table> 
   

3. Identique à 2), vous l'avez comme une variable Java, mais vous aimeriez l'obtenir par Ajax dans JSP.Ensuite, créez une classe Servlet qui effectue les opérations suivantes dans doGet() méthode:

   response.setCharacterEncoding("UTF-8"); 
   response.setContentType("application/json"); 
   response.getWriter().write(jsonPersons); 
   

   et l'appeler par Ajax jQuery avec un rappel qui fait la même chose que 1).

   $(document).ready(function() { 
       var table = $('<table/>').appendTo($('#somediv')); 
       $.getJSON('url/to/servlet', function(persons) { 
        persons.each(function(i, person) { 
         $('<tr/>').appendTo(table) 
          .append($('<td/>').text(person.name)) 
          .append($('<td/>').text(person.address)); 
        }); 
       }); 
   });