error in beans/form processing using jsp files in java web application

问题:

I used beans/form processing to take input parameters on login screen and then with those parameters try and log the user into the application.

However I am getting an error-

org.apache.jasper.JasperException: /loginbean.jsp(6,59) Attribute value request.getParameter("userName") is quoted with " which must be escaped when used within the val

The line of code which has this error is the second line in the block of code given below- (ie line of code for the property with name='userName')

loginbean.jsp

<jsp:useBean id="db" scope="request" class="logbean.LoginBean" >   <jsp:setProperty name="db" property="userName" value="<%=request.getParameter("userName")%>"/>   <jsp:setProperty name="db" property="password" value="<%=request.getParameter("password")%>"/>  </jsp:useBean> 

LoginBean.java

package logbean; public class LoginBean {   String userName="";   String password="";   public String getUserName() {   return userName;   }   public void setUsername(String username) {   this.userName = userName;   }   public String getPassword() {   return password;   }   public void setPassword(String password) {  this.password = password;   }   } 

回答1:

Here,

<jsp:setProperty name="db" property="userName" value="<%=request.getParameter("userName")%>"/> <jsp:setProperty name="db" property="password" value="<%=request.getParameter("password")%>"/> 

you're attempting to mix scriptlets and taglibs. This is invalid. Use the one or the other. Since scriptlets is a dead technology, I'd suggest to just get rid of it altogether. The proper way would be to use EL:

<jsp:setProperty name="db" property="userName" value="${param.userName}"/> <jsp:setProperty name="db" property="password" value="${param.password}"/> 

Alternatively, you can also let JSP automagically set all properties if all parameter names are the same as property names anyway:

<jsp:setProperty name="db" property="*"/> 

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