package com.ruoyi.common.utils;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import java.beans.IntrospectionException;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class TemplateUtils {
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private static final Pattern PATTERN = Pattern.compile("\\$\\{([^}]+)\\}");
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private static final ObjectMapper OM = new ObjectMapper();
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public static String render(String template, Object bean) {
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if (template == null || bean == null) {
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return template;
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}
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Matcher matcher = PATTERN.matcher(template);
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StringBuffer sb = new StringBuffer();
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while (matcher.find()) {
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String exp = matcher.group(1);
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Object val = getValueByExp(bean, exp);
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String strVal = val == null ? "" : val.toString();
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matcher.appendReplacement(sb, Matcher.quoteReplacement(strVal));
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}
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matcher.appendTail(sb);
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return sb.toString();
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}
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private static Object getValueByExp(Object root, String exp) {
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try {
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Object curr = root;
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if (exp.contains("#json.")) {
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String[] parts = exp.split("#json\\.", 2);
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String beanField = parts[0];
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String jsonPath = parts[1];
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Object jsonStrObj = getBeanField(curr, beanField);
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// ========== Java8 兼容修改点 ==========
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if (!(jsonStrObj instanceof String)) {
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return null;
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}
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String jsonStr = (String) jsonStrObj;
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if (jsonStr.trim().isEmpty()) {
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return null;
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}
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JsonNode node = OM.readTree(jsonStr);
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return getJsonNode(node, jsonPath);
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}
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String[] props = exp.split("\\.");
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for (String p : props) {
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curr = getBeanField(curr, p);
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if (curr == null) {
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break;
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}
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}
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return curr;
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} catch (Exception e) {
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return null;
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}
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}
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private static Object getBeanField(Object bean, String fieldName)
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throws IntrospectionException, InvocationTargetException, IllegalAccessException {
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if (bean == null) {
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return null;
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}
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PropertyDescriptor pd = new PropertyDescriptor(fieldName, bean.getClass());
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Method getter = pd.getReadMethod();
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return getter.invoke(bean);
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}
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private static Object getJsonNode(JsonNode node, String path) {
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String[] arr = path.split("\\.");
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JsonNode curr = node;
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for (String k : arr) {
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curr = curr.get(k);
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if (curr == null) {
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return null;
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}
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}
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return curr.isValueNode() ? curr.asText() : curr.toString();
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}
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// 测试
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public static void main(String[] args) {
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class User {
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private String name = "张三";
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private Integer age = 25;
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private String ext = "{\"phone\":\"13800138000\",\"addr\":{\"city\":\"杭州\"}}";
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public String getName() { return name; }
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public Integer getAge() { return age; }
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public String getExt() { return ext; }
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}
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User u = new User();
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String tpl = "姓名:${name},年龄:${age},手机号:${ext#json.phone},城市:${ext#json.addr.city}";
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System.out.println(render(tpl, u));
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}
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}
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