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| 1 | +package com.codingapi.springboot.fast.jpa.repository; |
| 2 | + |
| 3 | +import com.alibaba.fastjson.JSON; |
| 4 | +import com.alibaba.fastjson.JSONArray; |
| 5 | +import com.alibaba.fastjson.JSONObject; |
| 6 | +import com.codingapi.springboot.framework.dto.request.PageRequest; |
| 7 | +import com.codingapi.springboot.framework.dto.request.Relation; |
| 8 | +import javax.servlet.http.HttpServletRequest; |
| 9 | +import org.springframework.data.domain.Sort; |
| 10 | +import org.springframework.util.StringUtils; |
| 11 | +import org.springframework.web.context.request.RequestContextHolder; |
| 12 | +import org.springframework.web.context.request.ServletRequestAttributes; |
| 13 | + |
| 14 | +import java.lang.reflect.Field; |
| 15 | +import java.util.ArrayList; |
| 16 | +import java.util.Base64; |
| 17 | +import java.util.Enumeration; |
| 18 | +import java.util.List; |
| 19 | +import java.util.stream.Collectors; |
| 20 | + |
| 21 | +/** |
| 22 | + * HttpServletRequest 请求参数解析成 PageRequest对象 |
| 23 | + */ |
| 24 | +public class SearchRequest { |
| 25 | + |
| 26 | + private int current; |
| 27 | + private int pageSize; |
| 28 | + |
| 29 | + private final HttpServletRequest request; |
| 30 | + |
| 31 | + private final List<String> removeKeys = new ArrayList<>(); |
| 32 | + |
| 33 | + private final PageRequest pageRequest; |
| 34 | + |
| 35 | + public SearchRequest() { |
| 36 | + ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes(); |
| 37 | + this.request = attributes.getRequest(); |
| 38 | + this.pageRequest = new PageRequest(); |
| 39 | + } |
| 40 | + |
| 41 | + public void setCurrent(int current) { |
| 42 | + this.current = current - 1; |
| 43 | + this.removeKeys.add("current"); |
| 44 | + } |
| 45 | + |
| 46 | + public void setPageSize(int pageSize) { |
| 47 | + this.pageSize = pageSize; |
| 48 | + this.removeKeys.add("pageSize"); |
| 49 | + } |
| 50 | + |
| 51 | + private String decode(String value) { |
| 52 | + return new String(Base64.getDecoder().decode(value)); |
| 53 | + } |
| 54 | + |
| 55 | + |
| 56 | + static class ClassContent { |
| 57 | + |
| 58 | + private final Class<?> clazz; |
| 59 | + private final PageRequest pageRequest; |
| 60 | + |
| 61 | + public ClassContent(Class<?> clazz, PageRequest pageRequest) { |
| 62 | + this.clazz = clazz; |
| 63 | + this.pageRequest = pageRequest; |
| 64 | + } |
| 65 | + |
| 66 | + public void addFilter(String key, String value) { |
| 67 | + Class<?> keyClass = getKeyType(key); |
| 68 | + Object v = JSON.parseObject(value, keyClass); |
| 69 | + pageRequest.addFilter(key, Relation.EQUAL, v); |
| 70 | + } |
| 71 | + |
| 72 | + public void addFilter(String key, List<String> value) { |
| 73 | + Class<?> keyClass = getKeyType(key); |
| 74 | + pageRequest.addFilter(key, Relation.IN, value.stream() |
| 75 | + .map(v -> JSON.parseObject(v, keyClass)) |
| 76 | + .toArray() |
| 77 | + ); |
| 78 | + } |
| 79 | + |
| 80 | + |
| 81 | + private Class<?> getKeyType(String key) { |
| 82 | + String[] keys = key.split("\\."); |
| 83 | + Class<?> keyClass = clazz; |
| 84 | + for (String k : keys) { |
| 85 | + Field[] fields = keyClass.getDeclaredFields(); |
| 86 | + for (Field field : fields) { |
| 87 | + if (field.getName().equals(k)) { |
| 88 | + keyClass = field.getType(); |
| 89 | + break; |
| 90 | + } |
| 91 | + } |
| 92 | + } |
| 93 | + return keyClass; |
| 94 | + } |
| 95 | + |
| 96 | + } |
| 97 | + |
| 98 | + PageRequest toPageRequest(Class<?> clazz) { |
| 99 | + pageRequest.setCurrent(current); |
| 100 | + pageRequest.setPageSize(pageSize); |
| 101 | + |
| 102 | + ClassContent content = new ClassContent(clazz, pageRequest); |
| 103 | + |
| 104 | + String sort = request.getParameter("sort"); |
| 105 | + if (StringUtils.hasLength(sort)) { |
| 106 | + sort = decode(sort); |
| 107 | + if (JSON.isValid(sort)) { |
| 108 | + removeKeys.add("sort"); |
| 109 | + JSONObject jsonObject = JSON.parseObject(sort); |
| 110 | + for (String key : jsonObject.keySet()) { |
| 111 | + String value = jsonObject.getString(key); |
| 112 | + if ("ascend".equals(value)) { |
| 113 | + pageRequest.addSort(Sort.by(key).ascending()); |
| 114 | + } else { |
| 115 | + pageRequest.addSort(Sort.by(key).descending()); |
| 116 | + } |
| 117 | + } |
| 118 | + } |
| 119 | + } |
| 120 | + |
| 121 | + |
| 122 | + String filter = request.getParameter("filter"); |
| 123 | + if (StringUtils.hasLength(filter)) { |
| 124 | + filter = decode(filter); |
| 125 | + if (JSON.isValid(filter)) { |
| 126 | + removeKeys.add("filter"); |
| 127 | + JSONObject jsonObject = JSON.parseObject(filter); |
| 128 | + for (String key : jsonObject.keySet()) { |
| 129 | + JSONArray value = jsonObject.getJSONArray(key); |
| 130 | + if (value != null && !value.isEmpty()) { |
| 131 | + List<String> values = value.stream().map(Object::toString).collect(Collectors.toList()); |
| 132 | + content.addFilter(key, values); |
| 133 | + } |
| 134 | + } |
| 135 | + } |
| 136 | + } |
| 137 | + |
| 138 | + Enumeration<String> enumeration = request.getParameterNames(); |
| 139 | + while (enumeration.hasMoreElements()){ |
| 140 | + String key = enumeration.nextElement(); |
| 141 | + if (!removeKeys.contains(key)) { |
| 142 | + String value = request.getParameter(key); |
| 143 | + if (StringUtils.hasLength(value)) { |
| 144 | + content.addFilter(key, value); |
| 145 | + } |
| 146 | + } |
| 147 | + } |
| 148 | + |
| 149 | + |
| 150 | + return pageRequest; |
| 151 | + } |
| 152 | + |
| 153 | + |
| 154 | +} |
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