Jsp/Servlet根据请求参数自动填充Java对象：表单Bean

（1）问题的引出：

为了简单方便我们需要一种可以一次性全部提交表单数据的技术，也就是要说的：Bean表单

（2）BeanUtilities代码如下：

 

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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）一下是利用一个收集保险雇员保险信息的servlet，用它来确定可行的保险计划和相关的费用。

 

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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 =
      "\n";
    String title = "Insurance Info for " + info.getName();
    out.println(docType +
                "\n" +
                "<title>" + title + "</title>\n" +
                "\n" +
                "<center>\n" +
                "<h1>" + title + "</h1>\n" +
                "<ul>\n" +
                "  <li>Employee ID: " +
                   info.getEmployeeID() + "\n" +
                "  </li><li>Number of children: " +
                   info.getNumChildren() + "\n" +
                "  </li><li>Married?: " +
                   info.isMarried() + "\n" +
                "</li></ul></center>");
  }
}

（4）连接数据库的javabean

 

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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）

 

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<title>Employee Insurance Signup</title>
 
<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>


（6）jar包的获取与使用：我们要使用工具类 必学的jar包，下载地址：http://download.csdn.net/detail/u010870518/7867181 别忘了添加配置！

 

 转自：http://www.2cto.com/kf/201409/331273.html

posted @ 2017-01-16 14:44  N神3  阅读(312)  评论(0)    收藏  举报