使用场景：关闭页面弹窗时执行sql语句。
其实js里执行sql语句有多种方式。
方式一：直接在js代码里调用sql语句，原则上不能使用，因为这将sql直接暴露在客户端，安全性极差。
方式二：在js里运用ajax技术，调用后台方法执行sql语句。
方式三：运用dwr框架，其实是对ajax技术进行了封装。
一、首先编写一个dwr.xml文件
<"1.0" encoding="utf-8""-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr//dwr20.dtd">
<dwr>
<allow>
<!-- 对呼叫类型的操作 -->
<create javascript="CallTypeOpDwr" creator="new">
<param name="class"
value="cn.etcom.jfgl.tel.fee.callType.CallTypeOpDwr" />
<include method="addCallType" />
<include method="modifyCallType" />
<include method="deleteCallType" />
<include method="updateSp" />
</create>
</allow>
<!-- 用户信息管理操作中用到的map配置 -->
<signatures>
<![CDATA[
import java.util.List;
import cn.etcom.jfgl.customer.tel.userInfo.UserInfoManageOpDwr;
UserInfoManageOpDwr.addUsersInfo(String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,Map<String,String>);
UserInfoManageOpDwr.addUserInfo(String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,Map<String,String>);
]]>
</signatures>
</dwr>
二、在web.xml文件里配置servlet
<!-- DWR相关配置 -->
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>
allowGetForSafariButMakeForgeryEasier
</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
三、写一个普通的JAVA类
package cn.etcom.jfgl.tel.fee.callType;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.json.JSONException;
import org.json.JSONObject;
import cn.etcom.common.utility.DBUtil;
import cn.etcom.common.utility.RsHandler;
import cn.etcom.common.utility.SqlActuator;
import cn.etcom.common.utility.StringUtil;
/*******************************************************************************
*
* @author 刘彦宁 2011-08-12
*
*/
// 处理呼叫类型的dwr
public class CallTypeOpDwr {
/***************************************************************************
* DWR 方法，执行存储过程。
*
*/
public String updateSp() {
String sql = "exec Pub_Sp_UpdateFieldMemo ";
Connection conn = DBUtil.getConnection();
PreparedStatement psmt = null;
try {
psmt = conn.prepareStatement(sql);
psmt.setString(1, "CALL");
boolean a = psmt.execute();
DBUtil.close(null, psmt, conn);
conn = DBUtil.getConnection();
psmt = conn.prepareStatement(sql);
psmt.setString(1, "USER");
boolean b = psmt.execute();
System.out.println(a);
System.out.println(b);
System.out.println("关闭弹窗执行存储过程 "+sql);
} catch (SQLException e) {
e.printStackTrace();
}finally {
DBUtil.close(null, psmt, conn);
}
return null;
}
}
四、写一个JSP页面，主要导入engine.js和相应的java类映射的js文件，然后编写js即可调用
//以下为jsp的引入js文件部分 <script type="text/javascript"> //设置根路径，放在 tab.js 前 var glbRootPath = "<%=basePath%>"; </script> <script src="/UploadFiles/2021-04-02/lhgcore.min.js">五、js文件里调用后台代码
var basePath = ""; if(typeof(glbRootPath) != "undefined"){ basePath = glbRootPath; document.write("<script type='text/javascript' src='"+basePath+"\/dwr\/engine.js'><\/script><script type='text/javascript' src='"+basePath+"\/dwr\/interface\/CallTypeOpDwr.js'><\/script>"); } /* 中间省略若干代码 */ . . . if(typeof(glbRootPath) != "undefined"&&$(this).parent().children().eq(0).text()=="呼叫类型设置"){ console.log("进来了"); DWREngine.setAsync(false); CallTypeOpDwr.updateSp(); }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。