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 ：
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<!doctype html><html><head><meta charset="utf-8"><title>insert title here</title></head><body> <form action="/requestdemo/requestdemo3" method="post"> 用户名：<input type="text" name="username"><br/> 密码：<input type="text" name="pwd"><br/> 性别：<input type="radio" name="sex" value="男" checked="checked">男 <input type="radio" name="sex" value="女">女<br/> 爱好：<input type="checkbox" name="hobby" value="足球">足球 <input type="checkbox" name="hobby" value="篮球">篮球 <input type="checkbox" name="hobby" value="排球">排球 <input type="checkbox" name="hobby" value="羽毛球">羽毛球<br/> 所在城市：<select name="city"> <option>---请选择---</option> <option value="bj">北京</option> <option value="sh">上海</option> <option value="sy">沈阳</option> </select> <br/> <input type="submit" value="点击注册"> </form></body></html> |
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
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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)
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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"); //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：
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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<string> names = request.getparameternames(); 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
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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<string, string[]> map = request.getparametermap(); for(map.entry<string,string[]> 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！）
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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 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
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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 。。。。）
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/zhanghaoliang/p/5622900.html
