JSP自定义标签的spring注入

package com.financegene.struts.tag.views;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.financegene.wm.pro.common.model.ProPfcats;
import com.financegene.wm.pro.info.service.ProductsInfoManager;

public class PfcatTag extends TagSupport {
 
 private static final long serialVersionUID = 1L;

 private String selectName;// 下拉框的名称
 private String selectId;// 下拉款的ID
 private List<ProPfcats> listValue;
 // @Resource(name = "pro.info.productsInfoManager")
 private ProductsInfoManager productsInfoManager;

 @Override
 public int doEndTag() throws JspException {

  JspWriter out = this.pageContext.getOut();
  // 获取service
  ServletContext servletContext = (this.pageContext).getServletContext();
  WebApplicationContext wac = WebApplicationContextUtils
    .getRequiredWebApplicationContext(servletContext);
  productsInfoManager = (ProductsInfoManager) wac
    .getBean("pro.info.productsInfoManager");
  listValue = productsInfoManager.getAllPfcats();
  // 拼jsp页面
  try {
   out.print("<select id=\"" + selectId + "\" name=\"" + selectName
     + "\">");
   out.print("<option value=\"\">请选择</option>");
   for (ProPfcats p : listValue) {
    Object pfcode = p.getPfcat_code();
    Object pfname = p.getPfcat_name();
    out.print("<option value=\"" + pfcode + "\">" + pfname
      + "</option>");
   }

   out.print("</select>");
  } catch (IOException e) {
   e.printStackTrace();
  }

  return super.doEndTag();
 }

 public String getSelectName() {
  return selectName;
 }

 public void setSelectName(String selectName) {
  this.selectName = selectName;
 }

 public String getSelectId() {
  return selectId;
 }

 public void setSelectId(String selectId) {
  this.selectId = selectId;
 }

}