通过button将form表单的数据提交到action层的实例

 <form id="handleform">
 <!-- 根据学生id修改学生信息 -->
 <input type="hidden" name="student.stuid"/><!-- 隐藏学生id -->
 <div class="input-group el_modellist" role="toolbar">
 <span class="el_spans">要修改的班级：</span>
 <select class="selectpicker form-control" name="student.className" id="fmchechunit" title="请选择">
 <option value="0">--请选择班级--</option>
 <option value="1">软件一班</option>
 <option value="2">软件二班</option>
 </select>
 </div>
 <span class="el_spans">学生姓名：</span>
 <input type="text" id="student.name"/>
 <div class="input-group el_modellist" role="toolbar">
 <span class="el_spans">学生详细信息：</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(){
 //通过ajax异步将数据发送给action层
 $.ajax({
 url : '${pageContext.request.contextPath}/stu/stu_upstudent.action',//这里写上你的action路径
 data : $("#handleform").serialize(),//将你在form表单上提交的数据序列化
 type : 'POST', //提交方式
 dataType : 'json', //提交的数据类型
 async:true, //是否异步
 success : function(data) {//这是个回调函数 data表示从action中传过来的json数据
 //弹出从action层传过来的json格式的数据(用来显示是否更新成功)
 alert(data.result);
 }
 });
 }
 </script>

@Controller
@Scope("prototype")
// 控制层，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();
 
　　　　　//通过json对象将修改反馈信息响应给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", "修改失败");
 }
 System.out.println(json.toString());
 response.setContentType("text/html;charset=UTF-8");
 response.getWriter().write(json.toString());
 return null;//如果不需要跳转页面就写上null,如果要跳转页面就自己另外写上
 }
}

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;
 }
 
}