jsp中调用Java

 jsp中调用Java

    0，导入包

    1，获取容器中的对象

    2，全局变量

    3，执行<%%>,执行并返回<%=%>（随处可写）

    4,所有<%%>代码可合看一体

    5，<%%>里面不可套用el表达式

    比如<input type="hidden" id="jgdw${st.index}" value="<%=cha.getDictValue("CURRENCY_TYPE_UNIT", ${dataMap.CURRENCY_TYPE})%>/${item.PRICE_UNIT2_CN}">

    这种可以：

    <input type="hidden" id="jgdw${st.index}" value="<%=cha.getDictValue("CURRENCY_TYPE_UNIT","B")%>/${item.PRICE_UNIT2_CN}">

 

 

 

示例：

 

@Controller

public class ChatController extends BaseController {

 

@Autowired

TbConObjService tbConObjService;

@Autowired

TbConOrdService tbConOrdService;

@Autowired

TbConOrdPriceService tbConOrdPriceService;

@Autowired

TbCusFirmService tbCusFirmService;

@Autowired

MessageSender topicSender;

@Autowired

TbCusUserService tbCusUserService;

@Autowired

VwDataAllallService vwDataAllallService;

 

@RequestMapping(value = "/chat/offer/getDictValue")

public String getDictValue(String currencyType ,String nowType) throws EsteelException, UnsupportedEncodingException {

Map param = new HashMap<String,Object>();

param.put("business_type", currencyType);

param.put("lookup_type", nowType);

List<Map> map = tbConObjService.getDictValue(param);

if(map!=null&&map.size()>0){

return map.get(0).get("LOOKUP_NAME")+"";

}else{

return "";

}

}

｝

 

 

 

 

<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>

<%@ include file="../common/include.inc.jsp"%>

<%@page import="com.esteel.chat.controller.*" %>

<%@page import="org.springframework.web.context.support.WebApplicationContextUtils"%>  

<%@page import="org.springframework.context.ApplicationContext"%> 

<%

  response.setHeader("P3P","CP=CAO PSA OUR"); 

ServletContext context = request.getSession().getServletContext();  

ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(context);

 

ChatController cha= (ChatController)ctx.getBean("chatController");

String dw= cha.getDictValue("CURRENCY_TYPE_UNIT", "B");

%>

<c:import url="../common/pagerForm.jsp"></c:import>

 

 

 

<label for="" class="c_ul_label w80 tr">询盘价格：</label>

<input type="hidden" id="jgdw${st.index}" value="<%=cha.getDictValue("CURRENCY_TYPE_UNIT", "B")%>/${item.PRICE_UNIT2_CN}">