Question

(ns pdf-try.core                                                                                                                            
  (:use clj-pdf.core)                                                                                                                       
  (:require clojure.java.io))                                                                                                               


(defn gen-pdf []                                                                                                                            
 (let [superman (javax.imageio.ImageIO/read "sample_logos/batman.jpeg")                                                                     
       batman (javax.imageio.ImageIO/read  "sample_logos/superman.jpeg")]                                                                   
   (println (new java.util.Date))                                                                                                           
   (pdf [{}  (for [i (range 80000)]                                                                                                         
               (do  [:paragraph                                                                                                             
                   [:image  superman]                                                                                                       
                   [:image batman]]))] "super.pdf")                                                                                         
   (println (new java.util.Date))))                                                                                                         


(defn -main                                                                                                                                 
  "I don't do a whole lot."                                                                                                                 
  [& args]                                                                                                                                  
  (println  "Hello, World!")                                                                                                                
  (gen-pdf))

我得到了：

 Exception in thread "main" java.lang.IllegalArgumentException: No matching method found: read                                                                                                                              
 What am I missing here ?

Answer 1

因为没有这样的静态read方法接受String作为ImageIO类中的参数。使用该路径创建一个文件，并将File作为参数传递。

(defn gen-pdf []                                                                                                                            
 (let [superman (javax.imageio.ImageIO/read "sample_logos/batman.jpeg")                                                                     
       batman (javax.imageio.ImageIO/read  (java.io.File. "sample_logos/superman.jpeg"))]                                                                   
   (println (java.util.Date.))                                                                                                           
   (pdf [{}  (for [i (range 80000)]                                                                                                         
               (do  [:paragraph                                                                                                             
                   [:image  superman]                                                                                                       
                   [:image batman]]))] "super.pdf")                                                                                         
   (println (java.util.Date.))))

并且，您错误地从Clojure调用Java类构造函数。您需要使用类似(Classname. args*)来从Clojure调用Java类构造函数。有关详细信息，请查看clojure-java-interop

Clojure无法识别javax.imageio.ImageIO的读取方法？

1 个答案: