取得请求体相关的信息
a)request.getParameter(String):String b)request.getParameterValues(String):String[] 注意：在GET请求方式下，如果参数不一致，返回null，可能出现空指针异常 c)BeanUtils框架能够自动将String参数设置到JavaBean对象中（commons-beanutils-1.8.0.jar、commons-logging.jar） 1)无需理会参数的类型，个数，但是参数名一定要和JavaBean中的字段一致 2)String->8种基本类型自动转换，非8种基本类型可以注册转换器材 3)String或String[]类型的参数自动感知装配
java代码：
import java.io.IOException;import java.io.PrintWriter;import java.lang.reflect.InvocationTargetException;import java.util.Enumeration;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;import cn.web.request.domain.User;public class Rdome3 extends HttpServlet { //http://localhost:8080/day04/Rdome3?username=jack&age=30&salary=5000&likes=dance&likes=sing回车 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //分别取得的客户端提交的信息 String strUsername =request.getParameter("username"); String strAge = request.getParameter("age"); String strSalary = request.getParameter("salary"); String[] strLikes = request.getParameterValues("likes"); //一对多； //判断 BeanUtils bu = new BeanUtils(); User user = new User(); Enumeration<String> enums = request.getParameterNames(); while(enums.hasMoreElements()) { String keys = enums.nextElement(); String[] values = request.getParameterValues(keys); try { bu.setProperty(user, keys, values); } catch (Exception e) { e.printStackTrace(); } } //处理中文 response.setContentType("text/html;charset=UTF-8"); PrintWriter pw = response.getWriter(); pw.write("用户名：" + strUsername + "<br/>"); pw.write("年龄：" + strAge + "<br/>"); pw.write("期望薪水：" + strSalary + "<br/>"); pw.write("爱好个数：" + strLikes + "<br/>"); pw.flush(); pw.close(); }}user.java
public class User { private String username; private int age; private double salary; private String[] likes; public User() { } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public double getSalary() { return salary; } public void setSalary(double salary) { this.salary = salary; } public String[] getLikes() { return likes; } public void setLikes(String[] likes) { this.likes = likes; }}
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