commons-beanutil应用

利用commons-beanutil自写一个java工具类:

public class MapToBeanUtil {

    /*
     * 传入一个map和一个类型,通过类型创建变量，把map中的数据封装到javabean对象中，然后返回对象
     */
    public static <T> T toBean(Map map,Class<T>clazz ) {
        try {
            T bean = clazz.newInstance();
            BeanUtils.populate(bean, map);
            return bean;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

再准备一个javabean：

public class User {
    private String name;
    private String password;
    private String sex;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    @Override
    public String toString() {
        return "Student [name=" + name + ", password=" + password + ", sex=" + sex
                + "]";
    }

}

jsp:

<body>
   <form action="<%=request.getContextPath() %>/RegistServlet" method="post">
   名称:<input type="text" name="name" /><br/>
   密码:<input type="text" name="password" /><br/>
   性别:<input type="text" name="sex" /><br/>
   <input type="submit" value="提交"/>
   </form>
</body>

servlet:

public class RegistServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //输出bean的返回对象
        System.out.println(MapToBeanUtil.toBean(request.getParameterMap(), User.class));

    }

}