SpringMVC 强大的注解方式，走一个流程，看看，这些注解用过么

• 实现方式一：

• Controller层：

import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Optional;

import org.apache.commons.lang3.StringUtils;
import org.bson.types.ObjectId;
import org.slf4j.helpers.MessageFormatter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.security.core.annotation.AuthenticationPrincipal;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
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.RestController;

import lombok.extern.slf4j.Slf4j;

/**
 * Created by wangqb/BGStone on 2017-07-11
 */
@RestController
@RequestMapping("/wqb")
@Slf4j
public class DisputableNoteController {
    @Autowired
    NoteDBRepository noteDBRepository;
    
    @Autowired
    EntityRepository entityRepository;
    
    @Autowired
    MongoTemplate mongoTemplate;
    
    @PreAuthorize("hasRole('" + admin + "') ")
    @GetMapping(value = "/querypage/{pageNo:[\d]+}/{pageSize:[\d]+}", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
    public ResponseEntity<?> queryData(@AuthenticationPrincipal UserDetails activeUser,
            @PathVariable String pageNo,
            @PathVariable String pageSize){
        
        logger.debug("User '{}' is allocating note.", activeUser.getUsername());
        int page = 1;
        int size = 20;
        if (pageNo != null) {
                page = Integer.valueOf(pageNo);
        }
        if (pageSize != null) {
            size = Integer.valueOf(pageSize);
        }
        
        
        Pageable pageable = new PageRequest(page,size);
        
            Page<Entity> entityPage = entityReponsitory.findByStatus(pageable);


        logger.debug("List<Invoice>.Size() '{}' was allocated to user '{}' for typing.", entityPage.getSize() <= 0 ? null : entityPage.getContent().size(),
                activeUser.getUsername());
        
        System.out.println("List<Entity>.all() " + result.toString() +" was allocated to user "+ activeUser.getUsername() +" for typing.");

        logger.info("List<Entity>.content() '{}' was allocated to user '{}' for typing.", entityPage.getSize() <= 0 ? null :entityPage.getContent().size(),
                activeUser.getUsername());
        return ResponseEntity.status(HttpStatus.OK).body(entityPage);
    }
    
    @PreAuthorize("hasRole('" + admin +"')")
    @GetMapping(value = {"/find/{id:.+}/data"}, produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
    public ResponseEntity<?> findById(@AuthenticationPrincipal UserDetails activeUser,
                        @PathVariable("id") String noteId){
        logger.debug("User '{}' is allocating note.", activeUser.getUsername());
        
        System.out.println(" Optional<Entity> "+ entityOptional.get().toString() +" was allocated to user "+ activeUser.getUsername() +" for typing.");
        
        logger.debug("Invoice '{}' was allocated to user '{}' for typing.", entityOptional == null ? null : entityOptional.get(),
                activeUser.getUsername());
        return ResponseEntity.status(HttpStatus.OK).body(entityOptional);
    }
}

• 数据持久层  Repository的代码

import org.bson.types.ObjectId;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import org.springframework.data.rest.core.annotation.RestResource;
import org.springframework.security.access.prepost.PreAuthorize;

import java.util.Optional;

/**
 * Created by *** on 2017/3/28.
 */
@RepositoryRestResource(collectionResourceRel = "test", path = "testpath", exported = true)
public interface EntityRepository extends MongoRepository<Entity, String>, EntityRepositoryCustom,
        EntityAllotRepositoryCustom {
    
    /*
     * Created by wangqb on 2017-07-11
     */
    @Query(value="{'status': 'condition' }")
    Page<Entity> findByStatus(Pageable pageable);
}

• 实现方式二：

查询条件版二：

        int page = 1;
        int size = 20;
        if (pageNo != null) {
                page = Integer.valueOf(pageNo);
        }
        if (pageSize != null) {
            size = Integer.valueOf(pageSize);
        }
        
        Pageable pageable = new PageRequest(page,size);

        Invoice invoiceVo = new Invoice();
        invoiceVo.setStatus(Invoice.Status.Incorrect);
        ExampleMatcher matcher = ExampleMatcher.matching()
                        .withMatcher("status", GenericPropertyMatchers.exact());
        Example example = Example.of(invoiceVo);
        
        Page<Invoice> invoicePage = invoiceRepository.findAll(example, pageable);