spring notes

Sitrone · Sitrone · commit 1b0d8e073182 · 2017-07-09T16:56:55.000+08:00
diff --git a/Notes/浮点数表示.png b/Notes/浮点数表示.png
diff --git a/spring-mvc/web-snippet/src/main/java/com/web/spring/DataBind.java b/spring-mvc/web-snippet/src/main/java/com/web/spring/DataBind.java
@@ -0,0 +1,160 @@
+package com.web.spring.databind;
+
+import com.web.spring.databind.domain.ResponseError;
+import com.web.spring.databind.domain.SimpleUser;
+import com.web.spring.databind.domain.ComplexUser;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import javax.validation.Valid;
+import org.springframework.beans.propertyeditors.CustomDateEditor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+/**
+ * Created by Administrator on 2017/7/9.
+ */
+@Controller
+@RequestMapping(value = "/databind")
+public class DataBind {
+
+    // 返回带有http status code的响应体
+
+    /**
+     * TODO http://localhost:18080/databind/simpleObject?name=sun&age=27
+     * 简单对象映射成对象中的字段,字段从url中的参数中读取
+     */
+    @GetMapping(value = "/simpleObject", produces = "application/json")
+    public ResponseEntity getSimpleObject(@Valid SimpleUser user, BindingResult result) {
+        if (result.hasErrors()) {
+            ResponseError error = new ResponseError(result.getFieldError().getDefaultMessage());
+            return new ResponseEntity(error, HttpStatus.BAD_REQUEST);
+        }
+        return new ResponseEntity(user, HttpStatus.OK);
+    }
+
+    /**
+     * TODO http://localhost:18080/databind/simpleObject?name=sun&age=27&contactInfo.phone=8888888
+     * 复杂对象映射，成第一级对象的字段加第二级字段的{属性名.字段}
+     */
+    @GetMapping(value = "complexObject")
+    public ResponseEntity getComplexObject(@Valid ComplexUser user, BindingResult result) {
+        if (result.hasErrors()) {
+            ResponseError error = new ResponseError(result.getFieldError().getDefaultMessage());
+            return new ResponseEntity(error, HttpStatus.BAD_REQUEST);
+        }
+        return new ResponseEntity(user, HttpStatus.OK);
+    }
+
+    // 指定responseBody的返回格式
+
+    /**
+     * TODO http://localhost:18080/databind/json?name=sunu&age=0015
+     * 返回json数据
+     */
+    @GetMapping(value = "/json", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+    @ResponseBody
+    public SimpleUser writeJson(@Valid SimpleUser user, BindingResult result) {
+        return new SimpleUser(user.getName(), user.getAge());
+    }
+
+    /**
+     * TODO http://localhost:18080/databind/json
+     * 请求体, 解析json请求体
+     * {
+     * "name": "sun",
+     * "age": 15
+     * }
+     */
+    @PostMapping(value = "/json", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+    @ResponseBody
+    public SimpleUser readJson(@Valid @RequestBody SimpleUser user, BindingResult result) {
+        return new SimpleUser(user.getName(), user.getAge());
+    }
+
+    /**
+     * 生成xml数据的模型, 需要使用注解去定义
+     */
+    @GetMapping(value = "/xml", produces = MediaType.APPLICATION_XML_VALUE)
+    @ResponseBody
+    public SimpleUser writeXml(@Valid SimpleUser user, BindingResult result) {
+        return user;
+    }
+
+    @PostMapping(value = "/xml", produces = MediaType.APPLICATION_XML_VALUE)
+    @ResponseBody
+    public SimpleUser readXml(@Valid @RequestBody SimpleUser user, BindingResult result) {
+        return user;
+    }
+
+    // 不指定responseBody的返回形式, 由客户端决定
+
+    /**
+     * Ref: http://www.baeldung.com/spring-httpmessageconverter-rest
+     * TODO http://localhost:18080/databind/typeByClient?name=sunu&age=0015
+     * TODO responseBody返回形式由client上报的header中的Accept决定
+     * Spring 4中会默认开启注解进行httpMessageConverter
+     */
+    @GetMapping(value = "/typeByClient")
+    @ResponseBody
+    public SimpleUser writeByClient(@Valid SimpleUser user, BindingResult result) {
+        return new SimpleUser(user.getName(), user.getAge());
+    }
+
+    // PropertyEditor 应用: 局部,　使用WebDataBinder绑定
+
+    /**
+     * TODO http://localhost:18080/databind/date?date=2017-07-09
+     */
+    @GetMapping(value = "/date")
+    @ResponseBody
+    public String getDate(Date date) {
+        return date.toString();
+    }
+
+//    @InitBinder("date")
+//    public void initDate(WebDataBinder binder) {
+//        binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));
+//    }
+
+
+    // Formatter 应用: 全局/局部 可扩展, 可实现注解配置
+    // spring 全局配置
+//    <annotation-driven conversion-service="myDateFormatter">
+//    </annotation-driven>
+//
+//    <beans:bean id="myDateFormatter"
+//    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
+//        <beans:property name="formatters">
+//            <beans:set>
+//                <beans:bean class="com.web.spring.databind.common.MyDateFormatter"></beans:bean>
+//            </beans:set>
+//        </beans:property>
+//    </beans:bean>
+    // TODO http://localhost:18080/databind/dateFormatter?date2=2017-07-09
+    // 注意: 传入的参数只能为date2 与方法参数保持一致
+    @GetMapping(value = "dateFormatter")
+    @ResponseBody
+    public String getFormatterDate(Date date2) {
+        return date2.toString();
+    }
+
+
+    // Converter 应用：全局/局部 可扩展
+    // TODO http://localhost:18080/databind/dateConverter?date=2017-07-09
+    // 注意: 传入的参数只能为date2 与方法参数保持一致
+    @GetMapping(value = "dateConverter")
+    @ResponseBody
+    public String getConverterDate(Date date) {
+        return date.toString();
+    }
+}
diff --git a/spring-mvc/web-snippet/src/main/java/com/web/spring/User.java b/spring-mvc/web-snippet/src/main/java/com/web/spring/User.java
@@ -0,0 +1,73 @@
+package com.web.spring.databind.domain;
+
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
+import javax.xml.bind.annotation.XmlRootElement;
+import org.hibernate.validator.constraints.Length;
+import org.hibernate.validator.constraints.NotEmpty;
+import org.hibernate.validator.constraints.Range;
+
+/**
+ * Created by Administrator on 2017/6/27.
+ */
+@XmlRootElement
+public class User {
+
+    @NotEmpty(message = "name can not be null.")
+    @Length(min = 2, max = 20)
+    private String name;
+
+    @NotNull(message = "age can not be null")
+    @Range(min = 12, max = 99, message = "age is between 12 to 99")
+    private Integer age;
+
+    public User() {
+    }
+
+    public User(String name, Integer age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+//    @Override
+//    public boolean equals(Object o) {
+//        if (this == o) return true;
+//        if (o == null || getClass() != o.getClass()) return false;
+//
+//        User user = (User) o;
+//
+//        if (!name.equals(user.name)) return false;
+//        return age.equals(user.age);
+//    }
+//
+//    @Override
+//    public int hashCode() {
+//        int result = name.hashCode();
+//        result = 31 * result + age.hashCode();
+//        return result;
+//    }
+
+//    @Override
+//    public String toString() {
+//        return "User{" +
+//                "name='" + name + '\'' +
+//                ", age=" + age +
+//                '}';
+//    }
+}
diff --git a/spring-mvc/web-snippet/src/main/java/com/web/spring/common/MyDateConverter.java b/spring-mvc/web-snippet/src/main/java/com/web/spring/common/MyDateConverter.java
@@ -0,0 +1,24 @@
+package com.web.spring.databind.common;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import org.springframework.core.convert.converter.Converter;
+
+/**
+ * Created by Administrator on 2017/7/9.
+ */
+public class MyDateConverter implements Converter<String, Date> {
+    private static final String pattern = "yyyy-MM-dd";
+
+    @Override
+    public Date convert(String source) {
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
+        try {
+            return simpleDateFormat.parse(source);
+        } catch (ParseException e) {
+            System.out.println(e.getMessage());
+        }
+        return null;
+    }
+}
diff --git a/spring-mvc/web-snippet/src/main/java/com/web/spring/common/MyDateFormatter.java b/spring-mvc/web-snippet/src/main/java/com/web/spring/common/MyDateFormatter.java
@@ -0,0 +1,26 @@
+package com.web.spring.databind.common;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import org.springframework.format.Formatter;
+
+/**
+ * 相对于Converter，source默认为String，converter接口中的Source可以为任意类型，更加灵活
+ * Created by Administrator on 2017/7/9.
+ */
+public class MyDateFormatter implements Formatter<Date>{
+    private static final String pattern = "yyyy-MM-dd";
+
+    @Override
+    public Date parse(String text, Locale locale) throws ParseException {
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
+        return simpleDateFormat.parse(text);
+    }
+
+    @Override
+    public String print(Date object, Locale locale) {
+        return null;
+    }
+}
diff --git a/spring-mvc/web-snippet/src/main/java/com/web/spring/databind.md b/spring-mvc/web-snippet/src/main/java/com/web/spring/databind.md
@@ -0,0 +1,8 @@
+### `PropertityEditor`  
+  内置的 可扩展, 局部使用`WebDataBinder`  
+
+### `Formatter`  
+  内置的 可扩展, 全局, 局部均可使用  
+
+### `Converter`  
+  内置的 不可扩展, 全局 局部均可使用
