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HTML-Teil
<script type="text/javascript">
// <![CDATA[
"use strict";
var xmlhttp = new XMLHttpRequest();
// verbinde XMLHttpRequest mit der "Event-Methode"
xmlhttp.onreadystatechange = readajax;
function testajax( form ) {
"use strict";
// Aufruf
xmlhttp.open("GET", "TestAjax01.php?parameter=wert");
xmlhttp.send(null);
}
function readajax() {
"use strict";
var elementajax = document.getElementById("ajax");
if (xmlhttp.readyState == 4) {
elementajax.innerHTML = xmlhttp.responseText;
}
else {
alert(xmlhttp.readyState);
}
}
// ]]>
</script>
</head>
<body>
<form>
<input type="button" value="Send" onclick="testajax(this.form)"/>
</form>
<div id="ajax"> </div>
</body>
</html>
</div>
JSP-Teil
<%@
page import = "java.util.* "
%>
<%@
page import = "java.text.* "
%>
<%
<%@ page import = "java.lang.reflect.* " %>
<%!
private String getJSon(Object obj) {
StringBuilder sb = new StringBuilder();
try {
Class c = obj.getClass();
Field[] fields;
fields = c.getDeclaredFields();
// { {"name": "Meier59", "mnr":12345}
sb.append("{");
int n=fields.length-1;
for(int i=0; i<n; i++) {
Field field = fields[i];
sb.append("\"");
sb.append(field.getName());
sb.append("\": ");
String s=field.getType().toString();
if (s.indexOf("String")>0) {
sb.append("\"");
sb.append(field.get(obj));
sb.append("\"");
}
else {
sb.append(field.get(obj));
}
if (i<n-1) {
sb.append(", ");
}
}
sb.append("}");
}
catch ( IllegalAccessException e) {
}
return sb.toString();
}
private class Student {
public String name="";
public int mnr=0;
public Student () {
}
public Student(String name, int mnr) {
this.name = name;
this.mnr = mnr;
}
public String toString() {
return name+", "+mnr;
}
public String getJSon() {
return "{\"name\": \""+name+"\", \"mnr\":"+mnr+"}";
}
} // class Student
%>
<%@ page import = "java.util.* " %>
<%@ page import = "java.text.* " %>
<%
String name = "Meier" + min;
int mnr = 12345;
Student std = new Student(name, mnr);
String ergebnis = "Ergebnis: " + std;
// niw get my own JSONObject, obly one call
ergebnis = getJSon(std);
out.println(ergebnis);
%>
%>
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