工作積累Java篇

行創雲篇

一 、後端控制的頁面跳轉

1. 第一種跳轉到某個視圖層，如tiles文件中定義的login，指向頁面的/WEB-INF/views/account/login.jsp
   所以當我使用return new ModelAndView("login");時實際是找到tiles中名爲login的視圖，渲染對應的login.jsp頁面到返回給前端顯示。[渲染視圖和頁面數據]

   tiles.xml部分代碼:

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE tiles-definitions PUBLIC
   	    "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
        "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
   <tiles-definitions>
   	<!-- account settings -->
      <definition name="login" extends="simpleLayout">
           <put-attribute name="content" value="/WEB-INF/views/account/login.jsp"/>
       </definition>
      <definition name="regist" extends="simpleLayout">
          <put-attribute name="content" value="/WEB-INF/views/account/regist.jsp"/>
      </definition>
     ···
     <!--公司主頁-->
    <definition name="trace-home" extends="singleLayout">
    	   <put-attribute name="content" value="/WEB-INF/views/trace/home.jsp"/>
     </definition>
    <!--項目主頁-->
     <definition name="project-index" extends="ns-layout">
    	   <put-attribute name="content" value="/WEB-INF/views/trace/project-index.jsp"/>
     </definition>
    <definition name="trace-index" extends="simpleLayout">
     	  <put-attribute name="content" value="/WEB-INF/views/trace/index.jsp"/>
    </definition>
   </tiles-definitions>
   
   

2. 第二種，拼接地址跳轉,相當於戳後臺指定接口。如CommonTraceController.java中有如下模塊，當我在控制層執行如下代碼時return new ModelAndView(new RedirectView("/trace", true));時，會去控制層找到xx/trace接口，按CommonTraceController.java中聲明的接口實際返回return new ModelAndView("project-index")，這個時候同第一種請求方式，即在tiles.xml中找到標籤爲“project-index”的頁面/WEB-INF/views/trace/project-index.jsp，渲染對應jsp的視圖和數據

   注：public RedirectView(String url, boolean contextRelative)函數表示重定向的一種構造方式，url表示需要重定向的地址，contextReleative表示是否延續之前的請求地址。如在localhost:8080/login下請求了該控制層，當contextReleative=true的會重定向到localhost:8080/trace；反之false會重定向到localhost:8080/login/trace

   CommonTraceController.java部分代碼

   @Controller
   @RequestMapping("/trace")
   public class CommonTraceController extends BaseController{
   	@RequestMapping(value={"/index"}, method = RequestMethod.GET)
   		public String index(Model model) {
      	 return "trace-index";
     }
   
   @RequestMapping(value={"/home"}, method = RequestMethod.GET)
   public String home(Model model) {
       return "trace-home";
   }
   
   @RequestMapping(value={""}, method = RequestMethod.GET)
   public String projectIndex(Model model) {
       return "project-index";
   }
   ···
   // 選擇合同公用頁面
   @RequestMapping(value={"/public/select/contract"}, method = RequestMethod.GET)
   public String publicSelectContract(Model model) {
       return "trace-public-select-contract";
   }
   // 選擇材料公用頁面
   @RequestMapping(value={"/public/select/material"}, method = RequestMethod.GET)
   public String publicSelectMaterial(Model model) {
       return "trace-public-select-material";
   }
   // 選擇材料類別公用頁面
   @RequestMapping(value={"/public/select/material/category"}, method = RequestMethod.GET)
   public String publicSelectMaterialCategory(Model model) {
       return "trace-public-select-material-category";
   }
   

}
```

參考資料

• Spring Boot中的return new ModelAndView(“xxx”) 和 return "xxx"的區別
• struts-configxml中contextRelative=true是什麼