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Jsp/Servlet根據請求參數自動填滿Java對象：表單Bean，servletbean

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Jsp/Servlet根據請求參數自動填滿Java對象：表單Bean，servletbean

（1）問題的引出：


為了簡單方便我們需要一種可以一次性全部提交表單資料的技術，也就是要說的：Bean表單

（2）BeanUtilities代碼如下：

package com.lc.ch04Biaodanshuju;import java.util.*;import javax.servlet.http.*;import org.apache.commons.beanutils.BeanUtils;public class BeanUtilities {    public static void populateBean(Object formBean,                                  HttpServletRequest request) {    populateBean(formBean, request.getParameterMap());  }    public static void populateBean(Object bean,                                  Map propertyMap) {    try {      BeanUtils.populate(bean, propertyMap);    } catch(Exception e) {      // Empty catch. The two possible exceptions are      // java.lang.IllegalAccessException and      // java.lang.reflect.InvocationTargetException.      // In both cases, just skip the bean operation.    }  }}


（3）一下是利用一個收集保險僱員保險資訊的servlet，用它來確定可行的保險計劃和相關的費用。 

package com.lc.ch04Biaodanshuju;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class SubmitInsuranceInfo extends HttpServlet {  public void doGet(HttpServletRequest request,                    HttpServletResponse response)      throws ServletException, IOException {    InsuranceInfo info = new InsuranceInfo();    BeanUtilities.populateBean(info, request);    response.setContentType("text/html");    PrintWriter out = response.getWriter();    String docType =      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +      "Transitional//EN\">\n";    String title = "Insurance Info for " + info.getName();    out.println(docType +                "<HTML>\n" +                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +                "<BODY BGCOLOR=\"#FDF5E6\">\n" +                "<CENTER>\n" +                "<H1>" + title + "</H1>\n" +                "<UL>\n" +                "  <LI>Employee ID: " +                   info.getEmployeeID() + "\n" +                "  <LI>Number of children: " +                   info.getNumChildren() + "\n" +                "  <LI>Married?: " +                   info.isMarried() + "\n" +                "</UL></CENTER></BODY></HTML>");  }}

（4）串連資料庫的javabean


package com.lc.ch04Biaodanshuju;public class InsuranceInfo {  private String name = "No name specified";  private String employeeID = "No ID specified";  private int numChildren = 0;  private boolean isMarried = false;  public String getName() {    return(name);  }   public void setName(String name) {    this.name = ServletUtilities.filter(name);  }  public String getEmployeeID() {    return(employeeID);  }    public void setEmployeeID(String employeeID) {    this.employeeID = ServletUtilities.filter(employeeID);  }  public int getNumChildren() {    return(numChildren);  }  public void setNumChildren(int numChildren) {    this.numChildren = numChildren;  }    public boolean isMarried() {    return(isMarried);  }  public void setMarried(boolean isMarried) {    this.isMarried = isMarried;  }}


（5）

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE>Employee Insurance Signup</TITLE></HEAD><BODY BGCOLOR="#FDF5E6"><CENTER><H1>Employee Insurance Signup</H1><FORM ACTION="/servlet/coreservlets.SubmitInsuranceInfo">  Name:  <INPUT TYPE="TEXT" NAME="name"><BR>  Employee ID: <INPUT TYPE="TEXT" NAME="employeeID"><BR>  Number of Children:  <INPUT TYPE="TEXT" NAME="numChildren"><BR>  <INPUT TYPE="CHECKBOX" NAME="married" VALUE="true">Married?<BR>  <CENTER><INPUT TYPE="SUBMIT"></CENTER></FORM></CENTER></BODY></HTML>

（6）jar包的擷取與使用：我們要使用工具類 必學的jar包，：http://download.csdn.net/detail/u010870518/7867181  別忘了添加配置！








怎取得servlet中把jsp頁面中的儲存form表單參數的javabean

javabean是自己編寫的，在servlet裡面擷取jsp頁面的參數，然後調用方法將參數封裝到javabean裡
 
jsp在servlet中建立了一個javabean對象,並向裡面傳遞了參數,現在通過jsp頁面調用servlet

理論上來說是不在了的。因為兩個頁面之間傳值我們會使用 .setAttribute()這個方法，把要儲存的值放到那裡面去，如果它還在的話那就不必這麼做了。所以理論上來說是不在了的。具體原理也不懂
 

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