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com.alibaba.jvm.sandbox.module.debug.HttpSupported Maven / Gradle / Ivy
package com.alibaba.jvm.sandbox.module.debug;
import com.alibaba.jvm.sandbox.api.util.GaArrayUtils;
import org.apache.commons.lang3.StringUtils;
import javax.servlet.http.HttpServletRequest;
import java.util.*;
import static javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST;
public class HttpSupported {
/**
* 封装HTTP错误码
*/
protected static class HttpErrorCodeException extends Exception {
private final int code;
HttpErrorCodeException(int code, String message) {
super(message);
this.code = code;
}
int getCode() {
return code;
}
}
interface Converter {
T convert(String string);
}
static Map, Converter> converterMap = new HashMap, Converter>();
static {
regConverter(new Converter() {
@Override
public String convert(String string) {
return string;
}
}, String.class);
regConverter(new Converter() {
@Override
public Long convert(String string) {
return Long.valueOf(string);
}
}, long.class, Long.class);
regConverter(new Converter() {
@Override
public Double convert(String string) {
return Double.valueOf(string);
}
}, double.class, Double.class);
regConverter(new Converter() {
@Override
public Integer convert(String string) {
return Integer.valueOf(string);
}
}, int.class, Integer.class);
}
/**
* 注册类型转换器
*
* @param converter 转换器
* @param typeArray 类型的Java类数组
* @param 类型
*/
protected static void regConverter(Converter converter, Class... typeArray) {
for (final Class type : typeArray) {
converterMap.put(type, converter);
}
}
private static T convert(final Converter converter,
final String string,
final String name) throws HttpErrorCodeException {
if (null == converter) {
throw new HttpErrorCodeException(SC_BAD_REQUEST, String.format("parameter:%s is unknow type!", name));
}
try {
return converter.convert(string);
} catch (Throwable cause) {
throw new HttpErrorCodeException(SC_BAD_REQUEST, String.format("paramater:%s is illegal format!", name));
}
}
protected static T getParameter(final HttpServletRequest req,
final String name,
final Converter converter,
final T defaultValue) throws HttpErrorCodeException {
final String string = req.getParameter(name);
// 参数值为空
if (StringUtils.isBlank(string)) {
if (null == defaultValue) {
throw new HttpErrorCodeException(SC_BAD_REQUEST, String.format("parameter:%s is require!", name));
}
return defaultValue;
}
// 参数值不为空
else {
return convert(converter, string, name);
}
}
protected static List getParameters(final HttpServletRequest req,
final String name,
final Converter converter,
final T... defaultValueArray) throws HttpErrorCodeException {
final String[] stringArray = req.getParameterValues(name);
if (GaArrayUtils.isEmpty(stringArray)) {
if (null == defaultValueArray) {
throw new HttpErrorCodeException(SC_BAD_REQUEST, String.format("parameter:%s is require!", name));
}
return Arrays.asList(defaultValueArray);
}
final List values = new ArrayList();
for (final String string : stringArray) {
values.add(convert(converter, string, name));
}
return values;
}
protected static String getParameter(final HttpServletRequest req,
final String name) throws HttpErrorCodeException {
return getParameter(
req, name,
String.class,
null
);
}
protected static String getParameter(final HttpServletRequest req,
final String name,
final String defaultString) throws HttpErrorCodeException {
return getParameter(
req,
name,
String.class,
defaultString
);
}
protected static T getParameter(final HttpServletRequest req,
final String name,
final Class type) throws HttpErrorCodeException {
return getParameter(
req,
name,
type,
null
);
}
protected static T getParameter(final HttpServletRequest req,
final String name,
final Class type,
final T defaultValue) throws HttpErrorCodeException {
return getParameter(
req,
name,
(Converter) converterMap.get(type),
defaultValue
);
}
protected static List getParameters(final HttpServletRequest req,
final String name,
final Class type,
final T... defaultValueArray) throws HttpErrorCodeException {
return getParameters(
req,
name,
(Converter) converterMap.get(type),
defaultValueArray
);
}
}
