<form id="handleform">    <!-- 根據學生id修改學生信息 -->    <input type="hidden" name="student.stuid"/><!-- 隱藏學生id -->    <div class="input-group el_modellist" role="toolbar">     <span class="el_spans">要修改的班級：</span>     <select class="selectpicker form-control" name="student.className" id="fmchechunit"      <option value="0">--請選擇班級--</option>      <option value="1">軟件一班</option>      <option value="2">軟件二班</option>     </select>    </div>    <span class="el_spans">學生姓名：</span>    <input type="text" id="student.name"/>     <div class="input-group el_modellist" role="toolbar">      <span class="el_spans">學生詳細信息：</span>      <textarea id="studentMsg" class="form-control texta" rows="10" name="student.msg"></textarea>     </div>     <div class="modal-footer">      <button id="submitButton" onclick="saveButton()" type="button" class="btn btn-primary">更新</button>     </div>   </form>   <script type="text/javascript">    function saveButton(){      //通過ajax異步將數據發送給action層      $.ajax({       url : '${pageContext.request.contextPath}/stu/stu_upstudent.action',//這里寫上你的action路徑       data : $("#handleform").serialize(),//將你在form表單上提交的數據序列化       type : 'POST', //提交方式       dataType : 'json', //提交的數據類型       async:true, //是否異步       success : function(data) {//這是個回調函數 data表示從action中傳過來的json數據       //彈出從action層傳過來的json格式的數據(用來顯示是否更新成功)       alert(data.result);       }      });    }   </script>

@Controller@Scope("prototype")// 控制層，多例模式public class DangerAction extends ActionSupport {  private Student student; public void setStudent(Student student){  this.student = student; } public Student getStudent(){  return this.student; }  @Resource private StudentService studentService; public StudentService getStudentService() {  return studentService; } public void setStudentService(StudentService studentService) {  this.studentService = studentService; } public String updateStudent throws Exception{    boolean flag = studentService.update(student);  HttpServletResponse response = ServletActionContext.getResponse();  　　　　　//通過json對象將修改反饋信息響應給jsp  JSONObject json = new JSONObject();  if (flag) {   System.out.println(flag);   json.put("result", "修改成功");  } else {   System.out.println(flag);   json.put("result", "修改失敗");  }  System.out.println(json.toString());  response.setContentType("text/html;charset=UTF-8");  response.getWriter().write(json.toString());  return null;//如果不需要跳轉頁面就寫上null,如果要跳轉頁面就自己另外寫上 }}

public class Student{ private int stuid; private int className; private int name; private String studentMsg; public int getStuid() {  return stuid; } public void setStuid(int stuid) {  this.stuid = stuid; } public int getClassName() {  return className; } public void setClassName(int className) {  this.className = className; } public int getName() {  return name; } public void setName(int name) {  this.name = name; } public String getStudentMsg() {  return studentMsg; } public void setStudentMsg(String studentMsg) {  this.studentMsg = studentMsg; } }