7、顯示和提交form
顯示，帶上空數據
@RequestMapping(method = RequestMethod.GET, params = "register")
public String prepare(Model model) {
Member m = new Member();
model.addAttribute(m);
return "member/edit";
}
form用spring標籤庫的幾個標籤
<%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form"%>
<sf:form method="POST" modelAttribute="member">
用戶名:<sf:input path="memberName"/>
密碼:<sf:password path="password"/>
Email Address:<sf:input path="email"/>
<input type="submit"/>
</sf:form>
modelAttribute：數據
path：屬性
8、處理form提交
@RequestMapping(method = RequestMethod.POST)
public String register(Member member,
BindingResult bindingResult,
) {
if (bindingResult.hasErrors()) {
return "member/edit";
}
service.addMember(member);
return "redirect:/member/"+member.getMemberName();
}
URLEncoder.encode用來處理重定向時的中文問題
9、驗證提交
<sf:form method="POST" modelAttribute="member">
用戶名:<sf:input path="memberName"/>
<sf:errors path="memberName" cssClass="error" />
密碼:<sf:password path="password"/>
<sf:errors path="password" cssClass="error" />
Email Address:<sf:input path="email"/>
<sf:errors path="email" cssClass="error" />
<input type="submit"/>
</sf:form>
控制器：
public String register(@Valid Member member,
BindingResult bindingResult,
) {...}
bean：
public class Member {
@Size(min=3, max=20, message="Username must be between 3 and 20 characters long.")
@Pattern(regexp="^[a-zA-Z0-9]+$",message="Username must be alphanumeric with no spaces")
private String memberName;
@Size(min=6, max=20,
message="The password must be at least 6 characters long.")
private String password;
...}
10、中文亂碼問題解決
web.xml
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
11、文件上傳
<bean id="multipartResolver" class=
"org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="500000"/>
</bean>
<sf:form method="POST" modelAttribute="member" enctype="multipart/form-data">
<input name="image" type="file"/>
<input type="submit"/>
上傳處理
@RequestMapping(method = RequestMethod.POST)
public String register( @RequestParam(value = "image", required = false) MultipartFile image) {
try {
if (!image.isEmpty()) {
validateImage(image);
saveImage(member.getMemberName() + ".jpg", image); //
}
} catch (Exception e) {
bindingResult.reject(e.getMessage());
return "member/edit";
}
return "redirect:/member/"+member.getMemberName();
}
}
private void validateImage(MultipartFile image) throws Exception {
if (!image.getContentType().equals("image/pjpeg")) {
throw new Exception("Only JPG images accepted");
}
}
private void saveImage(String filename, MultipartFile image)
throws Exception {
try {
File file = new File(webRootPath + "/resources/" + filename);
FileUtils.writeByteArrayToFile(file, image.getBytes());
} catch (IOException e) {
throw new Exception("Unable to save image", e);
}
}
