Java tutorial
/* * Copyright 2011-2016 ZXC.com All right reserved. This software is the confidential and proprietary information of * ZXC.com ("Confidential Information"). You shall not disclose such Confidential Information and shall use it only in * accordance with the terms of the license agreement you entered into with ZXC.com. */ package com.ms.commons.summer.web.handler; import java.lang.reflect.Method; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.lang.StringUtils; import org.springframework.beans.BeanUtils; import org.springframework.beans.SimpleTypeConverter; import org.springframework.beans.TypeMismatchException; import org.springframework.core.GenericTypeResolver; import org.springframework.core.LocalVariableTableParameterNameDiscoverer; import org.springframework.core.MethodParameter; import org.springframework.core.ParameterNameDiscoverer; import org.springframework.validation.BindException; import org.springframework.validation.Errors; import org.springframework.validation.FieldError; import org.springframework.validation.MapBindingResult; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartRequest; import com.ms.commons.summer.web.annotations.PathPattern; import com.ms.commons.summer.web.annotations.PathVariable; import com.ms.commons.summer.web.util.BasePathMatcher; /** * @author zxc Apr 12, 2013 4:11:37 PM */ public class DataBinderUtil { /** * ? * * @param method * @param model * @param request * @param response * @param c * @return */ @SuppressWarnings("unchecked") public static Object[] getArgs(Method method, Map<String, Object> model, HttpServletRequest request, HttpServletResponse response, Class<?> c) { Class<?>[] paramTypes = method.getParameterTypes(); Object[] args = new Object[paramTypes.length]; Map<String, Object> argMap = new HashMap<String, Object>(args.length); Map<String, String> pathValues = null; PathPattern pathPattern = method.getAnnotation(PathPattern.class); if (pathPattern != null) { String path = request.getRequestURI(); int index = path.lastIndexOf('.'); if (index != -1) { path = path.substring(0, index); String[] patterns = pathPattern.patterns(); pathValues = getPathValues(patterns, path); } } MapBindingResult errors = new MapBindingResult(argMap, ""); ParameterNameDiscoverer parameterNameDiscoverer = new LocalVariableTableParameterNameDiscoverer(); for (int i = 0; i < paramTypes.length; i++) { Class<?> paramType = paramTypes[i]; MethodParameter methodParam = new MethodParameter(method, i); methodParam.initParameterNameDiscovery(parameterNameDiscoverer); GenericTypeResolver.resolveParameterType(methodParam, c.getClass()); String paramName = methodParam.getParameterName(); // map if (Map.class.isAssignableFrom(paramType)) { args[i] = model; } // HttpServletRequest else if (HttpServletRequest.class.isAssignableFrom(paramType)) { args[i] = request; } // HttpServletResponse else if (HttpServletResponse.class.isAssignableFrom(paramType)) { args[i] = response; } // HttpSession else if (HttpSession.class.isAssignableFrom(paramType)) { args[i] = request.getSession(); } // Errors else if (Errors.class.isAssignableFrom(paramType)) { args[i] = errors; } // MultipartFile else if (MultipartFile.class.isAssignableFrom(paramType)) { MultipartFile[] files = resolveMultipartFiles(request, errors, paramName); if (files != null && files.length > 0) { args[i] = files[0]; } } // MultipartFile[] else if (MultipartFile[].class.isAssignableFrom(paramType)) { args[i] = resolveMultipartFiles(request, errors, paramName); } else { // ?? if (BeanUtils.isSimpleProperty(paramType)) { SimpleTypeConverter converter = new SimpleTypeConverter(); Object value; // ? if (paramType.isArray()) { value = request.getParameterValues(paramName); } else { Object[] parameterAnnotations = methodParam.getParameterAnnotations(); value = null; if (parameterAnnotations != null && parameterAnnotations.length > 0) { if (pathValues != null && pathValues.size() > 0) { for (Object object : parameterAnnotations) { if (PathVariable.class.isInstance(object)) { PathVariable pv = (PathVariable) object; if (StringUtils.isEmpty(pv.value())) { value = pathValues.get(paramName); } else { value = pathValues.get(pv.value()); } break; } } } } else { value = request.getParameter(paramName); } } try { args[i] = converter.convertIfNecessary(value, paramType, methodParam); model.put(paramName, args[i]); } catch (TypeMismatchException e) { errors.addError(new FieldError(paramName, paramName, e.getMessage())); } } else { // ???POJO if (paramType.isArray()) { ObjectArrayDataBinder binder = new ObjectArrayDataBinder(paramType.getComponentType(), paramName); args[i] = binder.bind(request); model.put(paramName, args[i]); } else { Object bindObject = BeanUtils.instantiateClass(paramType); SummerServletRequestDataBinder binder = new SummerServletRequestDataBinder(bindObject, paramName); binder.bind(request); BindException be = new BindException(binder.getBindingResult()); List<FieldError> fieldErrors = be.getFieldErrors(); for (FieldError fieldError : fieldErrors) { errors.addError(fieldError); } args[i] = binder.getTarget(); model.put(paramName, args[i]); } } } } return args; } protected static Map<String, String> getPathValues(String[] patterns, String path) { BasePathMatcher matcher = new BasePathMatcher(); Map<String, String> pathValues = null; for (String pattern : patterns) { pathValues = matcher.extractUriTemplateVariables(pattern, path); if (pathValues.size() > 0) { return pathValues; } } return pathValues; } @SuppressWarnings("unchecked") private static MultipartFile[] resolveMultipartFiles(HttpServletRequest request, MapBindingResult errors, String paramName) { if (request instanceof MultipartRequest) { try { Map<String, Object> map = ((MultipartRequest) request).getFileMap(); MultipartFile[] multipartFiles = null; Object value = map.get(paramName); if (value instanceof MultipartFile) { multipartFiles = new MultipartFile[] { (MultipartFile) value }; } else { multipartFiles = (MultipartFile[]) value; } return multipartFiles; } catch (Exception e) { errors.reject("fileuploaderror", e.getMessage()); } } return null; } public static Object[] createObjectArray(HttpServletRequest request, String name, Class<?> clazz) throws Exception { ObjectArrayDataBinder binder = new ObjectArrayDataBinder(clazz, name); return binder.bind(request); } }