getrequestparameterhandler.java

来自「scwcd的考试,测试代码,如果希望参加此类考试将非常的有帮助」· Java 代码 · 共 36 行

package scwcd.lab12.taglib;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.*;
import javax.servlet.ServletRequest;
import java.io.IOException;

public class GetRequestParameterHandler extends TagSupport {
  String name= "";
   
  public void setName(String name) {
    this.name = name;
  }
  
  public int doStartTag() throws JspException {
    ServletRequest request = pageContext.getRequest();
    String paramValue = request.getParameter(name);
    JspWriter out = pageContext.getOut();
  
    try {
      if ( paramValue==null | paramValue.length()==0 ) {
        out.print("N/A");         
      } 
      out.print(paramValue);      
    } catch (IOException ioe) {
      throw new JspException(ioe);
    }    
    return SKIP_BODY;
  }  
  public int doEndTag() {
    return EVAL_PAGE;
  }
  public void release() {
    name = "";
  }
}