Introducing Spring Framework

Chapter 12 ■ Exposing a REST API
Listing 12-3 shows the DocumentRespository class, which implements the DocumentDAO interface. Before you
had only three defined methods in the DocumentDAO interface, and its implementation had very specific properties
to hold each SQL statement. Now you modified it by adding the removeById method, adding a map that will now hold
the SQL statements. Also, you refined the save method because now you are taking care of some null values.
Let’s see how the DocumentController will expose those resources over HTTP, as described in Table 12-2. Listing
12-4 shows your DocumentController class.
Listing 12-4. DocumentController.java
package com.apress.isf.spring.web;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.apress.isf.java.model.Document;
import com.apress.isf.java.service.DocumentService;
@Controller
@RequestMapping("/documents")
public class DocumentController {
174
@Autowired
DocumentService documentFacade;
@RequestMapping(method=RequestMethod.GET)
public @ResponseBody List getDocuments(){
return documentFacade.getAllDocuments();
}
@RequestMapping(value="/{id}",method=RequestMethod.GET)
public @ResponseBody Document findDocument(@PathVariable String id){
return documentFacade.findDocumentById(id);
}
@RequestMapping(method=RequestMethod.POST)
public @ResponseBody Document addDocument(@RequestBody Document document){
String id = document.getDocumentId();
return documentFacade.saveDocument(id,document);
}
@RequestMapping(value="/{id}",method=RequestMethod.PUT)
public @ResponseBody Document updateDocument(
@RequestBody Document document, @PathVariable String id){
return documentFacade.saveDocument(id,document);
}