jetbrick-template 杂记(一) SpringMVC, JSR303

自己扩展的函数

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import jetbrick.template.JetAnnotations.Functions;
import jetbrick.template.JetContext;
import jetbrick.template.runtime.JetPageContext;
import jetbrick.template.web.JetWebContext;

import org.springframework.context.MessageSource;
import org.springframework.context.NoSuchMessageException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.servlet.support.RequestContextUtils;

@Functions
public class SpringFunctions {

	private static final List<String> EMPTY_STRING_LIST = Collections.unmodifiableList(new ArrayList<String>());

	public static List<String> errors(JetPageContext ctx, String filedName) {
		HttpServletRequest request = (HttpServletRequest) ctx.getContext().get(JetWebContext.REQUEST);

		Errors errors = findErrors(ctx);
		if (errors == null) {
			System.out.println("没有找到Errors");
			return EMPTY_STRING_LIST;
		}

		List<FieldError> fes =  errors.getFieldErrors(filedName);
		List<String> msgs = new ArrayList<String>(0);

		for(FieldError fe : fes) {
			String[] codes = fe.getCodes();
			String defaultMsg = fe.getDefaultMessage();
			Object[] args = fe.getArguments();
			Locale locale = findLocale(request);
			MessageSource ms = findMessageSource(request);

			if (codes == null || codes.length == 0 || ms == null) {
				msgs.add(defaultMsg);
			} else {
				String msg = null;
				for (int i = 0; i < codes.length; i ++) {
					try {
						msg = ms.getMessage(codes[i], args, locale);
					} catch (NoSuchMessageException e) {
						// 忽略
					}
					if (msg == null) {
						msg = defaultMsg;
					}
				}
				msgs.add(msg);
			}
		}

		return Collections.unmodifiableList(msgs);
	}

	public static List<String> errors(JetPageContext ctx) {
		HttpServletRequest request = (HttpServletRequest) ctx.getContext().get(JetWebContext.REQUEST);

		Errors errors = findErrors(ctx);
		if (errors == null) {
			return EMPTY_STRING_LIST;
		}

		List<ObjectError> oes = errors.getGlobalErrors();
		List<String> msgs = new ArrayList<String>(0);

		for (ObjectError oe : oes) {
			String[] codes = oe.getCodes();
			String defaultMsg = oe.getDefaultMessage();
			Object[] args = oe.getArguments();
			Locale locale = findLocale(request);
			MessageSource ms = findMessageSource(request);

			if (codes == null || codes.length == 0 || ms == null) {
				msgs.add(defaultMsg);
			} else {
				String msg = null;
				for (int i = 0; i < codes.length; i ++) {
					try {
						msg = ms.getMessage(codes[i], args, locale);
					} catch (NoSuchMessageException e) {
						// 忽略
					}
					if (msg == null) {
						msg = defaultMsg;
					}
				}
				msgs.add(msg);
			}
		}
		return Collections.unmodifiableList(msgs);
	}

	@SuppressWarnings("unchecked")
	private static Errors findErrors(JetPageContext ctx) {
		try {
			JetContext jetContext = ctx.getContext();
			Field[] fileds = JetContext.class.getDeclaredFields();

			Field f = null;
			for (Field field : fileds) {
				if (field.getName().equals("context")) {
					f = field;
					break;
				}
			}

			if (f == null) {
				return null;
			}

			f.setAccessible(true);
			Map<String, Object> context = (Map<String, Object>) f.get(jetContext);
			Set<String> keyset = context.keySet();
			String key = null;

			for (String k : keyset) {
				if (k.startsWith(BindingResult.MODEL_KEY_PREFIX)) {
					key = k;
					break;
				}
			}

			if (key == null) {
				return null;
			}

			return (Errors) jetContext.get(key);
		} catch (Exception e) {
//			e.printStackTrace();
		}

		return null;
	}

	private static MessageSource findMessageSource(HttpServletRequest request) {
		return RequestContextUtils.getWebApplicationContext(request);		// WebApplicationContext本身就是MessageSource的实现
	}

	private static Locale findLocale(HttpServletRequest request) {
		return RequestContextUtils.getLocale(request);
	}
}

由JSR303标注验证的Bean

public class TestForm implements java.io.Serializable {

	private static final long serialVersionUID = 4120123239547893935L;

	@NotNull
	private Integer id;
	@NotNull
	@Length(min = 3, max = 12)
	private String name;
	@NotNull
	private Integer age;

    // getter & setter
}

Controller

@Controller
public class TestController {

	@RequestMapping(value = "/test", method = {RequestMethod.GET})
	public String test(@Validated TestForm form, BindingResult br, ModelMap modelMap) {

		br.reject(null, "故意加入一个全局错误");
		br.reject(null, "另一个全局错误");
		br.rejectValue("id", null, "id field的一个由java代码添加的错误");
		if (br.hasErrors()) {
			return "test";
		}
		return "ok";
	}
}

jetx

<html>
	<head>
		<base href="${webroot()}" />
		<title>错误</title>
	</head>

	<body>
		<h1>ERROR JETX</h1>

		<div>
			<h3>全局错误</h3>
			#set(List<String> gel = errors())
			<ul>
			#for(String msg : gel) 
				<li>${msg}</li>
			#end
			</ul>
		</div>

		<div>
			<h3>Field错误 (id)</h3>
			#set(List<String> idMsg = errors("id"))
			<ul>
			#for(String msg : idMsg) 
				<li>${msg}</li>
			#end
			</ul>
		</div>

		<div>
			<h3>Field错误 (name)</h3>
			#set(List<String> nameMsg = errors("name"))
			<ul>
			#for(String msg : nameMsg) 
				<li>${msg}</li>
			#end
			</ul>
		</div>

		<div>
			<h3>Field错误 (age)</h3>
			#set(List<String> ageMsg = errors("name"))
			<ul>
			#for(String msg : ageMsg) 
				<li>${msg}</li>
			#end
			</ul>
		</div>
	</body>
</html>