private String determineHeaderExpression(
Header headerAnnotation, MethodParameter methodParameter) {
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
String headerName = null;
String relativeExpression = "";
String valueAttribute = headerAnnotation.value();
if (!StringUtils.hasText(valueAttribute)) {
headerName = methodParameter.getParameterName();
} else if (valueAttribute.indexOf('.') != -1) {
String tokens[] = valueAttribute.split("\\.", 2);
headerName = tokens[0];
if (StringUtils.hasText(tokens[1])) {
relativeExpression = "." + tokens[1];
}
} else {
headerName = valueAttribute;
}
Assert.notNull(
headerName,
"Cannot determine header name. Possible reasons: -debug is "
+ "disabled or header name is not explicitly provided via @Header annotation.");
String headerRetrievalExpression = "headers['" + headerName + "']";
String fullHeaderExpression = headerRetrievalExpression + relativeExpression;
String fallbackExpression =
(headerAnnotation.required())
? "T(org.springframework.util.Assert).isTrue(false, 'required header not available: "
+ headerName
+ "')"
: "null";
return headerRetrievalExpression
+ " != null ? "
+ fullHeaderExpression
+ " : "
+ fallbackExpression;
}
private UriComponents applyContributers(
UriComponentsBuilder builder,
Method method,
Object[] argumentValues,
Map<String, Object> uriVars) {
if (this.contributors.isEmpty()) {
return builder.buildAndExpand(uriVars);
}
int paramCount = method.getParameters().length;
int argCount = argumentValues.length;
Assert.isTrue(
paramCount == argCount,
"Number of method parameters "
+ paramCount
+ " does not match number of argument values "
+ argCount);
for (int i = 0; i < paramCount; i++) {
MethodParameter param = new MethodParameter(method, i);
param.initParameterNameDiscovery(parameterNameDiscoverer);
for (UriComponentsContributor c : this.contributors) {
if (c.supportsParameter(param)) {
c.contributeMethodArgument(
param, argumentValues[i], builder, uriVars, this.conversionService);
break;
}
}
}
return builder.buildAndExpand(uriVars);
}
/**
* Gets parameter name of this action input parameter.
*
* @return name
*/
public String getParameterName() {
String ret;
String parameterName = methodParameter.getParameterName();
if (parameterName == null) {
methodParameter.initParameterNameDiscovery(new LocalVariableTableParameterNameDiscoverer());
ret = methodParameter.getParameterName();
} else {
ret = parameterName;
}
return ret;
}
/**
* Creates a new instance of {@link Parameters}.
*
* @param method
*/
public Parameters(Method method) {
Assert.notNull(method);
this.parameters = new ArrayList<Parameter>();
List<Class<?>> types = Arrays.asList(method.getParameterTypes());
for (int i = 0; i < types.size(); i++) {
MethodParameter parameter = new MethodParameter(method, i);
parameter.initParameterNameDiscovery(discoverer);
parameters.add(createParameter(parameter));
}
this.pageableIndex = types.indexOf(Pageable.class);
this.sortIndex = types.indexOf(Sort.class);
assertEitherAllParamAnnotatedOrNone();
}
private String asString(HandlerMethod handlerMethod) {
StringBuilder sb = new StringBuilder();
sb.append("\nController:\n").append(handlerMethod.getBeanType().getSimpleName());
sb.append("\nMethod:\n");
sb.append(handlerMethod.getMethod().getReturnType().getSimpleName()).append(" ");
sb.append(handlerMethod.getMethod().getName()).append("(");
for (MethodParameter param : handlerMethod.getMethodParameters()) {
param.initParameterNameDiscovery(this.parameterNameDiscoverer);
for (Annotation annotation : param.getParameterAnnotations()) {
sb.append(annotation).append(" ");
}
sb.append(param.getParameterType().getSimpleName()).append(" ");
sb.append(param.getParameterName());
if (param.getParameterIndex() < handlerMethod.getMethodParameters().length - 1) {
sb.append(" ");
}
}
sb.append(")\n");
return sb.toString();
}
private static UriComponents applyContributors(
UriComponentsBuilder builder, Method method, Object... args) {
CompositeUriComponentsContributor contributor = getConfiguredUriComponentsContributor();
if (contributor == null) {
logger.debug("Using default CompositeUriComponentsContributor");
contributor = defaultUriComponentsContributor;
}
int paramCount = method.getParameterTypes().length;
int argCount = args.length;
if (paramCount != argCount) {
throw new IllegalArgumentException(
"Number of method parameters "
+ paramCount
+ " does not match number of argument values "
+ argCount);
}
final Map<String, Object> uriVars = new HashMap<String, Object>();
for (int i = 0; i < paramCount; i++) {
MethodParameter param = new MethodParameter(method, i);
param.initParameterNameDiscovery(parameterNameDiscoverer);
contributor.contributeMethodArgument(param, args[i], builder, uriVars);
}
// We may not have all URI var values, expand only what we have
return builder
.build()
.expand(
new UriComponents.UriTemplateVariables() {
@Override
public Object getValue(String name) {
return uriVars.containsKey(name)
? uriVars.get(name)
: UriComponents.UriTemplateVariables.SKIP_VALUE;
}
});
}
private Object[] resolveInitBinderArguments(
Object handler, Method initBinderMethod, WebDataBinder binder, NativeWebRequest webRequest)
throws Exception {
Class[] initBinderParams = initBinderMethod.getParameterTypes();
Object[] initBinderArgs = new Object[initBinderParams.length];
for (int i = 0; i < initBinderArgs.length; i++) {
MethodParameter methodParam = new MethodParameter(initBinderMethod, i);
methodParam.initParameterNameDiscovery(this.parameterNameDiscoverer);
GenericTypeResolver.resolveParameterType(methodParam, handler.getClass());
String paramName = null;
boolean paramRequired = false;
String paramDefaultValue = null;
String pathVarName = null;
Annotation[] paramAnns = methodParam.getParameterAnnotations();
for (Annotation paramAnn : paramAnns) {
if (RequestParam.class.isInstance(paramAnn)) {
RequestParam requestParam = (RequestParam) paramAnn;
paramName = requestParam.value();
paramRequired = requestParam.required();
paramDefaultValue = requestParam.defaultValue();
break;
} else if (ModelAttribute.class.isInstance(paramAnn)) {
throw new IllegalStateException(
"@ModelAttribute is not supported on @InitBinder methods: " + initBinderMethod);
} else if (PathVariable.class.isInstance(paramAnn)) {
PathVariable pathVar = (PathVariable) paramAnn;
pathVarName = pathVar.value();
}
}
if (paramName == null && pathVarName == null) {
Object argValue = resolveCommonArgument(methodParam, webRequest);
if (argValue != WebArgumentResolver.UNRESOLVED) {
initBinderArgs[i] = argValue;
} else {
Class paramType = initBinderParams[i];
if (paramType.isInstance(binder)) {
initBinderArgs[i] = binder;
} else if (BeanUtils.isSimpleProperty(paramType)) {
paramName = "";
} else {
throw new IllegalStateException(
"Unsupported argument ["
+ paramType.getName()
+ "] for @InitBinder method: "
+ initBinderMethod);
}
}
}
if (paramName != null) {
initBinderArgs[i] =
resolveRequestParam(
paramName, paramRequired, paramDefaultValue, methodParam, webRequest, null);
} else if (pathVarName != null) {
initBinderArgs[i] = resolvePathVariable(pathVarName, methodParam, webRequest, null);
}
}
return initBinderArgs;
}
@SuppressWarnings("unchecked")
private Object[] resolveHandlerArguments(
Method handlerMethod,
Object handler,
NativeWebRequest webRequest,
ExtendedModelMap implicitModel)
throws Exception {
Class[] paramTypes = handlerMethod.getParameterTypes();
Object[] args = new Object[paramTypes.length];
for (int i = 0; i < args.length; i++) {
MethodParameter methodParam = new MethodParameter(handlerMethod, i);
methodParam.initParameterNameDiscovery(this.parameterNameDiscoverer);
GenericTypeResolver.resolveParameterType(methodParam, handler.getClass());
String paramName = null;
String headerName = null;
boolean requestBodyFound = false;
String cookieName = null;
String pathVarName = null;
String attrName = null;
boolean required = false;
String defaultValue = null;
boolean validate = false;
int found = 0;
Annotation[] paramAnns = methodParam.getParameterAnnotations();
for (Annotation paramAnn : paramAnns) {
if (RequestParam.class.isInstance(paramAnn)) {
RequestParam requestParam = (RequestParam) paramAnn;
paramName = requestParam.value();
required = requestParam.required();
defaultValue = requestParam.defaultValue();
found++;
} else if (RequestHeader.class.isInstance(paramAnn)) {
RequestHeader requestHeader = (RequestHeader) paramAnn;
headerName = requestHeader.value();
required = requestHeader.required();
defaultValue = requestHeader.defaultValue();
found++;
} else if (RequestBody.class.isInstance(paramAnn)) {
requestBodyFound = true;
found++;
} else if (CookieValue.class.isInstance(paramAnn)) {
CookieValue cookieValue = (CookieValue) paramAnn;
cookieName = cookieValue.value();
required = cookieValue.required();
defaultValue = cookieValue.defaultValue();
found++;
} else if (PathVariable.class.isInstance(paramAnn)) {
PathVariable pathVar = (PathVariable) paramAnn;
pathVarName = pathVar.value();
found++;
} else if (ModelAttribute.class.isInstance(paramAnn)) {
ModelAttribute attr = (ModelAttribute) paramAnn;
attrName = attr.value();
found++;
} else if (Value.class.isInstance(paramAnn)) {
defaultValue = ((Value) paramAnn).value();
} else if ("Valid".equals(paramAnn.annotationType().getSimpleName())) {
validate = true;
}
}
if (found > 1) {
throw new IllegalStateException(
"Handler parameter annotations are exclusive choices - "
+ "do not specify more than one such annotation on the same parameter: "
+ handlerMethod);
}
if (found == 0) {
Object argValue = resolveCommonArgument(methodParam, webRequest);
if (argValue != WebArgumentResolver.UNRESOLVED) {
args[i] = argValue;
} else if (defaultValue != null) {
args[i] = resolveDefaultValue(defaultValue);
} else {
Class paramType = methodParam.getParameterType();
if (Model.class.isAssignableFrom(paramType) || Map.class.isAssignableFrom(paramType)) {
args[i] = implicitModel;
} else if (SessionStatus.class.isAssignableFrom(paramType)) {
args[i] = this.sessionStatus;
} else if (Errors.class.isAssignableFrom(paramType)) {
throw new IllegalStateException(
"Errors/BindingResult argument declared "
+ "without preceding model attribute. Check your handler method signature!");
} else if (BeanUtils.isSimpleProperty(paramType)) {
paramName = "";
} else {
attrName = "";
}
}
}
if (paramName != null) {
args[i] =
resolveRequestParam(
paramName, required, defaultValue, methodParam, webRequest, handler);
} else if (headerName != null) {
args[i] =
resolveRequestHeader(
headerName, required, defaultValue, methodParam, webRequest, handler);
} else if (requestBodyFound) {
args[i] = resolveRequestBody(methodParam, webRequest, handler);
} else if (cookieName != null) {
args[i] =
resolveCookieValue(
cookieName, required, defaultValue, methodParam, webRequest, handler);
} else if (pathVarName != null) {
args[i] = resolvePathVariable(pathVarName, methodParam, webRequest, handler);
} else if (attrName != null) {
WebDataBinder binder =
resolveModelAttribute(attrName, methodParam, implicitModel, webRequest, handler);
boolean assignBindingResult =
(args.length > i + 1 && Errors.class.isAssignableFrom(paramTypes[i + 1]));
if (binder.getTarget() != null) {
doBind(binder, webRequest, validate, !assignBindingResult);
}
args[i] = binder.getTarget();
if (assignBindingResult) {
args[i + 1] = binder.getBindingResult();
i++;
}
implicitModel.putAll(binder.getBindingResult().getModel());
}
}
return args;
}
/**
* 得到参数列表
*
* @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 {
// 简单数据类型
if (BeanUtils.isSimpleProperty(paramType)) {
SimpleTypeConverter converter = new SimpleTypeConverter();
Object value;
// 是否是数组
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 {
// 复杂数据类型POJO类
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;
}