瀏覽器請求界面

1.獲取參數手動封裝數據

@WebServlet("/ServletDemo4") public class ServletDemo4 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//根據參數名獲取參數值String name = req.getParameter("name");String password = req.getParameter("password");String[] hobby = req.getParameterValues("hobby");//將數據封裝到學生對象中Student stu = new Student(name, password, hobby);System.out.println(stu);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }打印結果： ---------------------------------------------------------- Student{name='zhangsan', age='123', hobby=[study, game, book]}

2.通過反射封裝數據

//通過反射封裝數據 @WebServlet("/ServletDemo5") public class ServletDemo5 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//1.獲取所有參數的信息Map<String, String[]> parameterMap = req.getParameterMap();Set<String> keys = parameterMap.keySet();//2.將數據封裝到學生對象中Student stu = new Student();//遍歷集合for (String key : keys) {String[] value = parameterMap.get(key);//獲取學生對象的屬性描述器[可以獲取對應變量的相應方法]try {PropertyDescriptor pd = new PropertyDescriptor(key, stu.getClass());//獲取setXxx方法;把屬性名首字母變大寫,加上一個set前綴，作為方法名Method method = pd.getWriteMethod();//執行方法給屬性賦值;需要判斷屬性對應的值是否>1[]if(value.length>1){//參數個數不匹配,因此會報異常wrong number of arguements//正確的調用方法是先將String數組強制轉換成Object,然后傳參數method.invoke(stu,(Object)value);}else {method.invoke(stu,value);}//System.out.println(stu); 每次屬性賦值都打印} catch (Exception e) {e.printStackTrace();}System.out.println(stu);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }打印結果： ---------------------------------------------------------- Student{name='zhangsan', age='123', hobby=[study, game, book]}

3.通過工具類(包)封裝數據【常用】

//通過工具類(包)封裝數據- @WebServlet("/ServletDemo6") public class ServletDemo6 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//1.獲取所有參數的信息Map<String, String[]> parameterMap = req.getParameterMap();//2.將數據封裝到學生對象中Student stu = new Student();//利用BeanUtils工具類，給學生對象的屬性賦值try {BeanUtils.populate(stu,parameterMap);System.out.println(stu);} catch (Exception e) {e.printStackTrace();}System.out.println(stu);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }Student{name='zhangsan', age='123', hobby=[study, game, book]}

BeanUtils工具類資源

總結

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