使用ssh做的jsp班级学生考试实现了一对多多对多的关系

package com.osiit.action; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Set; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.ModelDriven; import com.osiit.bean.ClassBean; import com.osiit.bean.ExamBean; import com.osiit.bean.StudentBean; import com.osiit.service.IClassService; import com.osiit.service.IStudentService; @SuppressWarnings("serial") public class StudentAction extends ActionSupport implements ModelDriven<StudentBean> { private StudentBean studentBean = new StudentBean(); private IStudentService studentService; private IClassService classService; public String saveStudent() { studentService.saveStudent(studentBean); return "success"; } public String getAllStudent() { List<StudentBean> list = studentService.getAllStudent(); ServletActionContext.getRequest().setAttribute("studentList", list); return "success"; } public String deleteStudent() { studentService.deleteStudent(studentBean); return "success"; } public String getOneStudent() { studentBean = studentService.getOneStudent(studentBean); List<ClassBean> list = classService.getAllClass(); ServletActionContext.getRequest().setAttribute("classList", list); return "update"; } public String updateStudent() { studentService.updateStudent(studentBean); return "success"; } public String showStudentExam() { // 获得该学生对象 studentBean = studentService.getOneStudent(studentBean); // 获得学生已考科目 List<ExamBean> list = new ArrayList<ExamBean>(); Set<ExamBean> examBeans = studentBean.getExamBeans(); for (ExamBean examBean : examBeans) { list.add(examBean); } // 获得学生未考科目 List<ExamBean> list2 = studentService.getStudentNoExam(studentBean); ServletActionContext.getRequest().setAttribute("alexamList", list); ServletActionContext.getRequest().setAttribute("noAlexamList", list2); ServletActionContext.getRequest().setAttribute("studentBean", studentBean); return "success"; } public String saveStudentExam() { studentBean = studentService.getOneStudent(studentBean); String examIds[] = ServletActionContext.getRequest() .getParameterValues("examId"); for (String examId : examIds) { ExamBean examBean = new ExamBean(); examBean.setExamId(Integer.parseInt(examId)); studentBean.getExamBeans().add(examBean); } studentService.updateStudent(studentBean); return "success"; } public String deleteStudentExam() { studentBean = studentService.getOneStudent(studentBean); String examIds[] = ServletActionContext.getRequest() .getParameterValues("examId"); Set<ExamBean> examBeans = studentBean.getExamBeans(); List<ExamBean> list = new ArrayList<ExamBean>(); for (ExamBean examBean : examBeans) { list.add(examBean); } //思路：把所有的考试科目便利出来放到list中 //for循环遍历list，将list中的值和examIds中的值进行比较 //如果list中的值和examIds中的值有对应的，那么就将examBeans中的值给删除掉 //最后执行更新 for (String examId : examIds) { for(int i=0;i<list.size();i++){ ExamBean examBean=list.get(i); if (examBean.getExamId() == Integer.parseInt(examId)) { examBeans.remove(examBean); } } } studentService.updateStudent(studentBean); return "success"; } public StudentBean getStudentBean() { return studentBean; } public void setStudentBean(StudentBean studentBean) { this.studentBean = studentBean; } public StudentBean getModel() { // TODO Auto-generated method stub return studentBean; } public void setStudentService(IStudentService studentService) { this.studentService = studentService; } public void setClassService(IClassService classService) { this.classService = classService; } }