spring - What is BeanNameViewResolver? -

i read documentation here, think spring documentation complex , hard understand, need little explanation beannameviewresolver.

can code example?

as explained in documentation,beannameviewresolver resolves views declared beans. of time need special-purpose views.

for example, need render excel spreadsheet. excel generation apache poi

<dependency>     <groupid>org.apache.poi</groupid>     <artifactid>poi</artifactid>     <version>3.6</version>    </dependency> 

so, subclass abstractexcelview and implement custom logic render spreadsheet based on model values.

public class customexcelview extends abstractexcelview {   @override     protected void buildexceldocument(map model, hssfworkbook workbook,         httpservletrequest request, httpservletresponse response)         throws exception {         map<string,string> revenuedata = (map<string,string>) model.get("revenuedata");         //create wordsheet         hssfsheet sheet = workbook.createsheet("revenue report");       hssfrow header = sheet.createrow(0);     header.createcell(0).setcellvalue("month");     header.createcell(1).setcellvalue("revenue");      int rownum = 1;     (map.entry<string, string> entry : revenuedata.entryset()) {         //create row data         hssfrow row = sheet.createrow(rownum++);         row.createcell(0).setcellvalue(entry.getkey());         row.createcell(1).setcellvalue(entry.getvalue());             } } 

}

and controller adds data

package com.example;  import java.util.hashmap; import java.util.map;  import org.springframework.stereotype.controller; import org.springframework.ui.model; import org.springframework.web.bind.annotation.requestmapping;     @controller @requestmapping("/excelview") public class excelcontroller {      public string getexcel(model model){         map<string,string> revenuedata = new hashmap<string,string>();         revenuedata.put("jan-2010", "$100,000,000");         revenuedata.put("feb-2010", "$110,000,000");         revenuedata.put("mar-2010", "$130,000,000");         revenuedata.put("apr-2010", "$140,000,000");         revenuedata.put("may-2010", "$200,000,000");         model.addattribute("revenuedata",revenuedata);          return "myexcelview";     }  } 

then declaring an beannameviewresolver makes available controllers: when controller returns string view name myexcelview, spreadsheet rendered.

<beans xmlns="http://www.springframework.org/schema/beans"     xmlns:context="http://www.springframework.org/schema/context"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="         http://www.springframework.org/schema/beans              http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/context          http://www.springframework.org/schema/context/spring-context-3.0.xsd">      <context:component-scan base-package="com.example" />      <bean class="org.springframework.web.servlet.view.beannameviewresolver" />      <bean id="myexcelview" class="com.example.customexcelview" />  </beans>