Servlet的5种方式实现表单提交（注册小功能），后台获取表单数据实例

Servlet的5种方式实现表单提交（注册小功能），后台获取表单数据实例

用servlet实现一个注册的小功能 ，后台获取数据。

注册页面：

注册页面代码 ：

用户名：

密码：

性别：男

女

爱好：足球

篮球

排球

羽毛球

所在城市：

---请选择---

北京

上海

沈阳

人员实体类： 注意：人员实体类要与表单中的name一致，约定要优于编码

package com.chensi.bean;

//实体类中的字段要与表单中的字段一致，约定优于编码

public class User {

private String userName;

private String pwd;

private String sex;

private String[] hobby;

private String city;

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getPwd() {

return pwd;

}

public void setPwd(String pwd) {

this.pwd = pwd;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public String[] getHobby() {

return hobby;

}

public void setHobby(String[] hobby) {

this.hobby = hobby;

}

public String getCity() {

return city;

}

public void setCity(String city) {

this.city = city;

}

}

接收方法一：         Servlet页面(后台接收数据方法一)

package com.chensi;

import java.io.IOException;

import java.util.Iterator;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet 获得填写的表单数据

*/

@WebServlet("/RequestDemo3")

public class RequestDemo3 extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

DRlvXu//获取传过来的表单数据,根据表单中的name获取所填写的值

String userName = request.getParameter("userName");

String pwd = request.getParameter("pwd");

String sex = request.getParameter("sex");

String[] hobbys = request.getParameterValues("hobby");

System.out.println(userName);

System.out.println(pwd);

System.out.println(sex);

for (int i = 0; hobbys!=null&&i < hobbys.length; i++) {

System.out.println(hobbys[i]+"\t");

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

得到的数据：

接收方法二：

package com.chensi;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Iterator;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet 获得填写的表单数据

*/

@WebServlet("/RequestDemo3")

public class RequestDemo3 extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

//获取传过来的表单数据,根据表单中的name获取所填写的值

Enumeration names = request.getParamhttp://eterNames();

while (names.hasMoreElements()) {

String strings = (String) names.nextElement();

String[] parameterValues = request.getParameterValues(strings);

for (int i = 0;parameterValues!=null&&i < parameterValues.length; i++) {

System.out.println(strings+":"+parameterValues[i]+"\t");

}

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

得到的数据：

接收方法三： 利用反射赋值给User

package com.chensi;

import java.beans.IntrospectionException;

import java.beans.PropertyDescriptor;

import java.io.IOException;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Enumeration;

import java.util.Iterator;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.chensi.bean.User;

/**

* Servlet 获得填写的表单数据

*/

@WebServlet("/RequestDemo3")

public class RequestDemo3 extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

//获取传过来的表单数据,根据表单中的name获取所填写的值

try {

User u = new User();

System.out.println("数据封装之前: "+u);

//获取到表单数据

Map map = request.getParameterMap();

for(Map.Entry m:map.entrySet()){

String name = m.getKey();

String[] value = m.getValue();

//创建一个属性描述器

PropertyDescriptor pd = new PropertyDescriptor(name, User.class);

//得到setter属性

Method setter = pd.getWriteMethod();

if(value.length==1){

setter.invoke(u, value[0]);

}else{

setter.invoke(u, (Object)value);

}

}

System.out.println("封装数据之后: "+u);

} catch (IntrospectionException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {

e.printStackTrace();

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

得到的结果：

接收方法四：使用apache 的 BeanUtils 工具来进行封装数据（ps：这个Benautils工具，Struts框架就是使用这个来获取表单数据的哦！）

package com.chensi;

import java.beans.IntrospectionException;

import java.beans.PropertyDescriptor;

import java.io.IOException;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Enumerationhttp://;

import java.util.Iterator;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import com.chensi.bean.User;

/**

* Servlet 获得填写的表单数据

*/

@WebServlet("/RequestDemo3")

public class RequestDemo3 extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

//获取传过来的表单数据,根据表单中的name获取所填写的值

//方法四：使用beanUtil来封装User类

User u = new User();

System.out.println("没有使用BeanUtil封装之前： "+u);

try {

BeanUtils.populate(u, request.getParameterMap());

System.out.println("使用BeanUtils封装之后： "+u);

} catch (IllegalAccessException | InvocationTargetException e) {

e.printStackTrace();

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

得到的结果：

接收方法 方式五： 使用inputStream流来进行接收（一般字符串啥的不用这个方法，一般是文件上传下载时候才会使用这种方法）因为接收到的字符串各种乱码，编码问题解决不好

package com.chensi;

import java.beans.IntrospectionException;

import java.beans.PropertyDescriptor;

import java.io.IOException;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Enumeration;

import java.util.Iterator;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.ServletInputStream;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import com.chensi.bean.User;

/**

* Servlet 获得填写的表单数据

*/

@WebServlet("/RequestDemo3")

public class RequestDemo3 extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

//获取传过来的表单数据,根据表单中的name获取所填写的值

response.setContentType("text/html;charset=UTF-8");

//获取表单数据

ServletInputStream sis = request.getInputStream();

int len = 0;

byte[] b = new byte[1024];

while((len=sis.read(b))!=-1){

System.out.println(new String(b, 0, len, "UTF-8"));

}

sis.close();

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

得到的结果：（各种乱码 。。。。）

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