我编写了一个java代码，它将从表中获取数据并显示输出。这基本上是我想通过Nashorn运行的脚本。
以下是我尝试的代码
public static void main(String args[]) throws ScriptException{
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
String script3 = "count = 0; "
+ "keyList = new java.util.ArrayList; "
+ "valueList = new java.util.ArrayList;"
+ "keyList.add('username'); "
+ "keyList.add('password'); "
+ "valueList.add('admin'); "
+ "valueList.add('admin');"
+ "java.lang.System.out.println('keyList :: ' + keyList); "
+ "java.lang.System.out.println('KeyValue :: ' + valueList);"
+ "sql = \" select * from credentials where 'isActive'='1'\";"
+ "java.lang.System.out.println('keyList.size() :: ' + keyList.size());"
+ "for (i = 0; i < keyList.size(); i++){"
+ " sql += and \\' + keyList.get(i) + \\' = \\' + valueList.get(i) + \\';}"
+ "java.lang.System.out.println('Search SQL : ' + sql); "
+ "con = GetConnected.connectToDatabase('my_db');"
+ "ps = con.prepareStatement(sql); "
+ "ps.setString(1, \"1\");"
+ "rs = ps.executeQuery(); "
+ "if (rs.isBeforeFirst()) {"
+ " count=1; "
+ " java.lang.System.out.println('Data is present in database'); "
+ "}"
+ "else "
+ " java.lang.System.out.println('Data is not present in database'); "
+ " rs.close(); " + " st.close(); " + " con.close(); ";
engine.eval(script3);
}
我得到的错误是
Exception in thread "main" javax.script.ScriptException: <eval>:1:904 Missing close quote
count = 0; keyList = new java.util.ArrayList; valueList = new java.util.ArrayList;keyList.add('username'); keyList.add('password'); valueList.add('admin'); valueList.add('admin');java.lang.System.out.println('keyList :: ' + keyList); java.lang.System.out.println('KeyValue :: ' + valueList);sql = " select * from credentials where 'isActive'='1'";java.lang.System.out.println('keyList.size() :: ' + keyList.size());for (i = 0; i < keyList.size(); i++){ sql += and \' + keyList.get(i) + \' = \' + valueList.get(i) + \';}java.lang.System.out.println('Search SQL : ' + sql); con = GetConnected.connectToDatabase('my_db');ps = con.prepareStatement(sql); ps.setString(1, "1");rs = ps.executeQuery(); if (rs.isBeforeFirst()) { count=1; java.lang.System.out.println('Data is present in database'); }else java.lang.System.out.println('Data is not present in database'); rs.close(); st.close(); con.close();
^ in <eval> at line number 1 at column number 904
at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:467)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:534)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:521)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399)
at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
at com.engine.nashorn.Test.main(Test.java:87)
Caused by: jdk.nashorn.internal.runtime.ParserException: <eval>:1:904 Missing close quote
count = 0; keyList = new java.util.ArrayList; valueList = new java.util.ArrayList;keyList.add('username'); keyList.add('password'); valueList.add('admin'); valueList.add('admin');java.lang.System.out.println('keyList :: ' + keyList); java.lang.System.out.println('KeyValue :: ' + valueList);sql = " select * from credentials where 'isActive'='1'";java.lang.System.out.println('keyList.size() :: ' + keyList.size());for (i = 0; i < keyList.size(); i++){ sql += and \' + keyList.get(i) + \' = \' + valueList.get(i) + \';}java.lang.System.out.println('Search SQL : ' + sql); con = GetConnected.connectToDatabase('my_db');ps = con.prepareStatement(sql); ps.setString(1, "1");rs = ps.executeQuery(); if (rs.isBeforeFirst()) { count=1; java.lang.System.out.println('Data is present in database'); }else java.lang.System.out.println('Data is not present in database'); rs.close(); st.close(); con.close();
^
at jdk.nashorn.internal.parser.Lexer.error(Lexer.java:1706)
at jdk.nashorn.internal.parser.Lexer.scanString(Lexer.java:988)
at jdk.nashorn.internal.parser.Lexer.lexify(Lexer.java:1615)
at jdk.nashorn.internal.parser.AbstractParser.getToken(AbstractParser.java:132)
at jdk.nashorn.internal.parser.AbstractParser.nextToken(AbstractParser.java:211)
at jdk.nashorn.internal.parser.AbstractParser.nextOrEOL(AbstractParser.java:170)
at jdk.nashorn.internal.parser.AbstractParser.next(AbstractParser.java:157)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:281)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:249)
at jdk.nashorn.internal.runtime.Context.compile(Context.java:1286)
at jdk.nashorn.internal.runtime.Context.compileScript(Context.java:1253)
at jdk.nashorn.internal.runtime.Context.compileScript(Context.java:625)
at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:532)
... 5 more
我认为将keyList和valueList值添加到sql查询的地方就是问题。
sql += and \\' + keyList.get(i) + \\' = \\' + valueList.get(i) + \\';}"
+将继续添加，直到脚本结束。