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;@Functionspublic 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);}}public class TestForm implements java.io.Serializable {private static final long serialVersionUID = 4120123239547893935L;@NotNullprivate Integer id;@NotNull@Length(min = 3, max = 12)private String name;@NotNullprivate Integer age; // getter & setter}@Controllerpublic 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";}}<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>