<s:iterator value="listTree">
 <tr>
  <td>
    <input type="checkbox" name="cb" value="<s:property value="cs.cid"/>" /> 
    <s:property value="cs.cname" />
  </td>
 </tr>
 </s:iterator>

private String[] cb;
	public String[] getCb() {
		return cb;
	}
	public void setCb(String[] cb) {
		this.cb = cb;
	}

        //批量
	public String batchAddStudents() {
		System.out.println("cb.length:"+cb.length);
	for(int i=0;i<cb.length;i++){
			list.add(this.service.findById(Integer.parseInt(cb[i])));
		}
		return SUCCESS;
	}

public String batchAddStudents() {
		List<Integer> ids = new ArrayList<Integer>();
		ids.add(id);
		studentService.saveStudentCourse(ids);
		return SUCCESS;
	}