Spring4 In Action-5.2.3-Spring Web應用程序-向頁面輸出列表、接收參數、接收表單
阿新 • • 發佈：2017-11-14
pla data prot template ack bin 通過 final span
源代碼鏈接：http://download.csdn.net/download/poiuy1991719/10117665
本代碼是基於數據庫表的操作，所以請先建立數據庫表
1、建立Bean對象
package spittr; import java.util.Date; import org.apache.commons.lang3.builder.EqualsBuilder; import org.apache.commons.lang3.builder.HashCodeBuilder; /** * 博客信息 */ public class Spittle { private finalLong id; private final String message; private final Date time; private Double latitude; private Double longitude; public Spittle(String message, Date time) { this(null, message, time, null, null); } public Spittle(Long id, String message, Date time, Double longitude, Double latitude) {this.id = id; this.message = message; this.time = time; this.longitude = longitude; this.latitude = latitude; } public long getId() { return id; } public String getMessage() { return message; } public Date getTime() { return time; } public Double getLongitude() {return longitude; } public Double getLatitude() { return latitude; } @Override public boolean equals(Object that) { return EqualsBuilder.reflectionEquals(this, that, "id", "time"); } @Override public int hashCode() { return HashCodeBuilder.reflectionHashCode(this, "id", "time"); } }
2、編寫Web配置類：
package spittr.config; import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer; import spittr.web.WebConfig; /*** * 容器會找到AbstractAnnotationConfigDispatcherServletInitializer這個類（包括這個類的擴展） * 然後用這個類來配置Servlet上下文 */ public class SpitterWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { @Override protected Class<?>[] getRootConfigClasses() {//非Web組件，帶有@Configuration註解的類用來定義應用上下文 return new Class<?>[] { RootConfig.class }; } @Override protected Class<?>[] getServletConfigClasses() {//指定配置類，帶有@Configuration註解的類用來定義應用上下文 return new Class<?>[] { WebConfig.class }; } @Override protected String[] getServletMappings() {// 將DispatcherServlet映射到"/" return new String[] { "/" }; } }
3、Web配置類中，用到WebConfig類：
package spittr.web;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
/***
* 配置web
*/
@Configuration //配置類，需要的註解
@EnableWebMvc //啟用Spring MVC
@ComponentScan("spittr.web") //啟用組件掃描，就會掃描到控制器
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver() {//配置JSP視圖解析器
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");//在請求路徑前，加入資源路徑
resolver.setSuffix(".jsp");//在請求路徑後，加入資源名稱，比如/WEB-INF/views/home.jsp
resolver.setViewClass(org.springframework.web.servlet.view.JstlView.class);
return resolver;
}
@Override
public void configureDefaultServletHandling( //處理靜態資源
DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
super.addResourceHandlers(registry);
}
}
4、Web配置類用到Root類，用來加載其它組件：
package spittr.config;
import java.util.regex.Pattern;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Import;
import org.springframework.core.type.filter.RegexPatternTypeFilter;
import spittr.config.RootConfig.WebPackage;
/***
* 引入數據庫配置類 自動掃描spittr包，以及子包
*/
@Configuration // 配置類，需要的註解
@Import(DataConfig.class)
@ComponentScan(basePackages = { "spittr" }, excludeFilters = { @Filter(type = FilterType.CUSTOM, value = WebPackage.class) })
public class RootConfig {
public static class WebPackage extends RegexPatternTypeFilter {
public WebPackage() {
super(Pattern.compile("spittr\\.web"));
}
}
}
5、Root類中加載了數據庫鏈接類：
package spittr.config;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
@Configuration
public class DataConfig {
@Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql:///spittle");
dataSource.setUsername("root");
dataSource.setPassword("root");
return dataSource;
}
@Bean
public JdbcOperations jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
}
6、數據操作接口、數據操作接口實現：
package spittr.data;
import java.util.List;
import spittr.Spittle;
public interface SpittleRepository {
List<Spittle> findRecentSpittles();
List<Spittle> findSpittles(long max, int count);
Spittle findOne(long id);
void save(Spittle spittle);
}
package spittr.data;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;
import spittr.Spittle;
@Repository //將數據訪問層 (DAO 層 ) 的類標識為 Spring Bean
public class JdbcSpittleRepository implements SpittleRepository {
private JdbcOperations jdbc;
@Autowired
public JdbcSpittleRepository(JdbcOperations jdbc) {
this.jdbc = jdbc;
}
public List<Spittle> findRecentSpittles() {
List<Spittle> spittleList=jdbc.query("select id, message, created_at, latitude, longitude"
+ " from Spittle" + " order by created_at desc limit 20",
new SpittleRowMapper());
// System.out.println("---findRecentSpittles被調用---返回List列表："+spittleList);
return spittleList;
}
public List<Spittle> findSpittles(long max, int count) {
List<Spittle> spittleList=jdbc.query("select id, message, created_at, latitude, longitude"
+ " from Spittle" + " where id < ?"
+ " order by created_at desc limit 20", new SpittleRowMapper(),
max);
// System.out.println("---findSpittles被調用---返回List列表："+spittleList);
return spittleList;
}
public Spittle findOne(long id) {
Spittle spittle=jdbc.queryForObject(
"select id, message, created_at, latitude, longitude"
+ " from Spittle" + " where id = ?",
new SpittleRowMapper(), id);
// System.out.println("---findOne被調用---返回Spittle對象："+spittle.getMessage());
return spittle;
}
public void save(Spittle spittle) {
// System.out.println("---save被調用---Spittle對象："+spittle.getMessage());
jdbc.update(
"insert into Spittle (message, created_at, latitude, longitude)"
+ " values (?, ?, ?, ?)", spittle.getMessage(),
spittle.getTime(), spittle.getLatitude(),
spittle.getLongitude());
}
private static class SpittleRowMapper implements RowMapper<Spittle> {
public Spittle mapRow(ResultSet rs, int rowNum) throws SQLException {
return new Spittle(rs.getLong("id"), rs.getString("message"),
rs.getDate("created_at"), rs.getDouble("longitude"),
rs.getDouble("latitude"));
}
}
}
7、編寫添加數據的表單類：
package spittr.web.spittle;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
/**
* 頁面表單對應模型
*/
public class SpittleForm {
@NotNull
@Size(min=1, max=140)
private String message;
@Min(-180)
@Max(180)
private Double longitude;
@Min(-90)
@Max(90)
private Double latitude;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Double getLongitude() {
return longitude;
}
public void setLongitude(Double longitude) {
this.longitude = longitude;
}
public Double getLatitude() {
return latitude;
}
public void setLatitude(Double latitude) {
this.latitude = latitude;
}
}
8、編寫控制類，實現頁面數據接收、頁面跳轉等
package spittr.web.spittle;
import java.util.Date;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import spittr.Spittle;
import spittr.data.SpittleRepository;
@Controller
public class SpittleController {
private static final String MAX_LONG_AS_STRING = "9223372036854775807";
private SpittleRepository spittleRepository;
@Autowired
public SpittleController(SpittleRepository spittleRepository) {
this.spittleRepository = spittleRepository;
}
/**
* 頁面輸出列表
* @param max
* @param count
* @param model
* @return
* http://localhost:8080/SpringInAction5_2_3/spittles
*/
@RequestMapping(value = "/spittles", method = RequestMethod.GET)
public String spittles(
@RequestParam(value = "max", defaultValue = MAX_LONG_AS_STRING) long max,
@RequestParam(value = "count", defaultValue = "20") int count,
Model model) {
model.addAttribute("sp_list1", spittleRepository.findSpittles(max, count));//頁面通過sp_list1取得列表
System.out.println("-------------------------輸出列表");
return "spittles";
}
/**
* 接收頁面一個參數，
* 輸出一條數據
* @param spittleId
* @param model
* @return
* http://localhost:8080/SpringInAction5_2_3/spittles/3
*/
@RequestMapping(value = "/spittle/{spittleId}", method = RequestMethod.GET)
public String spittle(@PathVariable("spittleId") long spittleId, Model model) {
model.addAttribute(spittleRepository.findOne(spittleId));
System.out.println("-------------------------輸出單個");
return "spittle_show";
}
/**
* 進入添加頁面
* @return
*/
@RequestMapping(value = "/spittle/spittleadd",method = RequestMethod.GET)
public String spittleAdd(){
return "spittle_add";
}
/**
* 添加一條數據
* @param form
* @param model
* @return
* @throws Exception
* http://localhost:8080/SpringInAction5_2_3/spittle/spittleadd
*/
@RequestMapping(value = "/spittle/spittleadd", method = RequestMethod.POST)
public String saveSpittle(SpittleForm form, Model model) throws Exception {
spittleRepository.save(new Spittle(null, form.getMessage(), new Date(), form.getLongitude(), form.getLatitude()));
System.out.println("-------------------------添加列表");
return "spittle_add";
}
}
Spring4 In Action-5.2.3-Spring Web應用程序-向頁面輸出列表、接收參數、接收表單